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• How to optimize this simple function which translates input bits into words?

  - by psihodelia

  I have written a function which reads an input buffer of bytes and produces an output buffer of words where every word can be either 0x0081 for each ON bit of the input buffer or 0x007F for each OFF bit. The length of the input buffer is given. Both arrays have enough physical place. I also have about 2Kbyte free RAM which I can use for lookup tables or so. Now, I found that this function is my bottleneck in a real time application. It will be called very frequently. Can you please suggest a way how to optimize this function? I see one possibility could be to use only one buffer and do in-place substitution. void inline BitsToWords(int8 *pc_BufIn, int16 *pw_BufOut, int32 BufInLen) { int32 i,j,z=0; for(i=0; i<BufInLen; i++) { for(j=0; j<8; j++, z++) { pw_BufOut[z] = ( ((pc_BufIn[i] >> (7-j))&0x01) == 1? 0x0081: 0x007f ); } } } Please do not offer any compiler specific or CPU/Hardware specific optimization, because it is a multi-platform project.

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• PHP include taking too long

  - by wxiiir

  I have a php file with around 100mb which is full of arrays (only arrays). I've made a script that includes this file (for processing), first it exhausted the default Xampp 128mb memory limit, i've raised it to 1024mb but it just takes forever and doesn't do anything. I'm sure the problem is being created by the sheer size of the file because i've tried removing all lines of code and just leaving the include and an echo for me to know when it finishes executing, and it does the same thing (which is taking forever), i've also tried to run the 100mb file in separate and same thing again. A 10mb file is taking forever as well but a similar 1mb file is almost instantly read and executed so the problem must be more than just the file size. I was avoiding using c++ for a simple project as this and would rather not to as php is easier for me and the task that will be executed doesn't need to benefit from the added speed that it would have if it had been done in c++ but if i have no luck in solving this problem i guess i'll have to. EDIT Reasons for not using a database: 1-Whoever made it didn't used a database and it will be pretty hard to store this in an organized database if i'm not able to do something with it first, like just reading it, copying parts from it or putting in memory or something. 2-I don't have experience working with databases as pretty much all stuff i've ever done in php didn't needed large amounts of stored data, 50kb at best, if i was thinking about a big project or huge chunks of data as this one, i definitely would, but i didn't made this mess to start with and now i have to undo it. 3-The logic for having to store a small portion of data like 10mb in hard drive when now every computer has pretty much enough ram to fit the whole OS in it is pretty much incomprehensible unless someone gives a good explanation about it, if i had to access a lot of said files simultaneously i would understand but like i said, this is a simple project, this is the only file that will be accessed at a given time this isn't even to make some kind of website, it's to run a few times and be done with it.

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• Developers: How does BitLocker affect performance?

  - by Chris

  I'm an ASP.NET / C# developer. I use VS2010 all the time. I am thinking of enabling BitLocker on my laptop to protect the contents, but I am concerned about performance degradation. Developers who use IDEs like Visual Studio are working on lots and lots of files at once. More than the usual office worker, I would think. So I was curious if there are other developers out there who develop with BitLocker enabled. How has the performance been? Is it noticeable? If so, is it bad? My laptop is a 2.53GHz Core 2 Duo with 4GB RAM and an Intel X25-M G2 SSD. It's pretty snappy but I want it to stay that way. If I hear some bad stories about BitLocker, I'll keep doing what I am doing now, which is keeping stuff RAR'ed with a password when I am not actively working on it, and then SDeleting it when I am done (but it's such a pain).

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• BitmapFactory.decodeFile out of memory with images 2400x2400

  - by alasarr

  I need to send an image from a file to a server. The server request the image in a resolution of 2400x2400. What I'm trying to do is: 1) Get a Bitmap using BitmapFactory.decodeFile using the correct inSampleSize. 2) Compress the image in JPEG with a quality of 40% 3) Encode the image in base64 4) Sent to the server I cannot achieve the first step, it throws an out of memory exception. I'm sure the inSampleSize is correct but I suppose even with inSampleSize the Bitmap is huge (around 30 MB in DDMS). Any ideas how can do it? Can I do these steps without created a bitmap object? I mean doing it on filesystem instead of RAM memory. This is the current code: // The following function calculate the correct inSampleSize Bitmap image = Util.decodeSampledBitmapFromFile(imagePath, width,height); // compressing the image ByteArrayOutputStream baos = new ByteArrayOutputStream(); image.compress(Bitmap.CompressFormat.JPEG, 40, baos); // encode image String encodedImage = Base64.encodeToString(baos.toByteArray(),Base64.DEFAULT));

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• Declaring two large 2d arrays gives segmentation fault.

  - by pfdevil

  Hello, i'm trying to declare and allocate memory for two 2d-arrays. However when trying to assign values to itemFeatureQ[39][16816] I get a segmentation vault. I can't understand it since I have 2GB of RAM and only using 19MB on the heap. Here is the code; double** reserveMemory(int rows, int columns) { double **array; int i; array = (double**) malloc(rows * sizeof(double *)); if(array == NULL) { fprintf(stderr, "out of memory\n"); return NULL; } for(i = 0; i < rows; i++) { array[i] = (double*) malloc(columns * sizeof(double *)); if(array == NULL) { fprintf(stderr, "out of memory\n"); return NULL; } } return array; } void populateUserFeatureP(double **userFeatureP) { int x,y; for(x = 0; x < CUSTOMERS; x++) { for(y = 0; y < FEATURES; y++) { userFeatureP[x][y] = 0; } } } void populateItemFeatureQ(double **itemFeatureQ) { int x,y; for(x = 0; x < FEATURES; x++) { for(y = 0; y < MOVIES; y++) { printf("(%d,%d)\n", x, y); itemFeatureQ[x][y] = 0; } } } int main(int argc, char *argv[]){ double **userFeatureP = reserveMemory(480189, 40); double **itemFeatureQ = reserveMemory(40, 17770); populateItemFeatureQ(itemFeatureQ); populateUserFeatureP(userFeatureP); return 0; }

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• Setting up a NAS with Citrix XenServer

  - by JasonBrown

  Just a quick query on anyone whos worked with XenServer, I want to setup a NAS at home but with virtualization (I've looked into VMWare Server and KVM, I quite like KVM!) but I was told about XenServer 5.5. I have comomodity hardware (ASUS board, dual core 2.66Ghz CPU with 8Gb RAM), I need to setup a fileserver to house about 2-3Tb worth of data (big chunky video - not porn!). Need to run Linux (preferably CentOS) but also run Windows virtualised for testing. I was thinking of going the XenServer route, however I want to be able to offer a VM access to the 2-3Tb of HDDs (5 HDD drives) directly so it can do its thing (maybe using FreeNAS). Would this be possible with XenServer? Or will I have to do more work - and another box - to offer this? My goals are to use FreeNAS (ZFS!) for the filesserver, CentOS for SVN and aother bits we need to use (LAMP Stack), Windows for our win32 testing all on one box. I see this iSCSI target bits and get scared.

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• What kind of online hosting do I need for a WCF-based service?

  - by mafutrct

  First of all, I'm not sure if SO is the right place to ask. Please migrate me if needed. I would like to host a WCF-based service so it is available for everyone. While hosting it on my personal, local servers succeeded, I would prefer to move it to an external service provider for various reasons. I'll be blunt: I have no clue about hosting providers. I know there are webhosters, virtual and root servers and several other services. What I would like to know is what kind of hosting I need in my case. I understand that a root server would easily fulfill my requirements, but that is not exactly cheap. The program I'd like to run on the server requires .NET 4, preferably on a windows machine. Access to a folder in the file system is much appreciated (1 GB storage is enough by far). Communication with clients (in form of an applications written in .NET) via opening a port on the server. Traffic is low (<<1 GB/month?) There is no website. Having the provider perform updates would be nice. My understanding is that a virtual server would be a possible solution. Prices seem start at around 5€/month, which is ok for me. However, I read that for these cheap solutions RAM is severely limited (~400 MB), and I'm not confident that is enough to run windows and a .NET application.

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• Live clock javascript starts from my custom time

  - by newworroo

  I was trying to create a live/dynamic clock is based on my custom time instead of system time. There are many scripts, but I couldn't find the clock starts from my custom time. Here is an example that I'm trying to modify. The problem is the seconds doesn't change, and it looks like I need to use ajax. Is there any way to do it without ajax? If not, help me to do it using ajax!!! The reason I don't like ajax method is that another page should be called and refreshed, so it will eat server ram. ex) http://www.javascriptkit.com/script/cut2.shtml Before: <script> function show(){ var Digital=new Date() var hours=Digital.getHours() var minutes=Digital.getMinutes() var seconds=Digital.getSeconds() ... ... After: <script> function show(){ var Digital=new Date() var hours=<?php echo $hr; ?>; var minutes=<?php echo $min; ?>; var seconds=<?php echo $sec; ?>; ... ...

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• Huge burst of memory in c# service, what could be the cause?

  - by Daniel

  I'm working on a c# service application and i have this problem where out of no where and for no obvious reason, the memory for the process will climb from 150mb to almost 2gb in about 5 seconds and then back to 150mb. But nothing in our system should be using any where near that amount of memory (so its probably a bug somewhere). It might be a tight while true loop somewhere but the cpu usage at the time was very low so i thought i'd look for other ideas. Now the weirder thing is when i compile the service for 64bit, the same massive burst will occur except it exceeded 10gb of ram (paging most of it) and it just caused lots of problems with the computer and everything running on it. After a while it shuts down but it looks like windows is still willing to give it more memory. Would you have any ideas or tools that i can use in order to find this? Yes it has lots of logging however nothing in the logs stand out as to why this is happening. I can run the service in a console app mode, so my next test was going to be running it in visual studio debugger and see if i can find anything. It only happens occasionally but usually about 10-20 minutes after startup. On 32bit mode it cleans up and continues on like normally. 64bit mode it crashes after a while and uses stupid amounts of memory. But i'm really stumped as to why this is happening!!!

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• Why doesn't my processor have built-in BigInt support?

  - by ol

  As far as I understood it, BigInts are usually implemented in most programming languages as strings containing numbers, where, eg.: when adding two of them, each digit is added one after another like we know it from school, e.g.: 246 816 * * ---- 1062 Where * marks that there was an overflow. I learned it this way at school and all BigInt adding functions I've implemented work similar to the example above. So we all know that our processors can only natively manage ints from 0 to 2^32 / 2^64. That means that most scripting languages in order to be high-level and offer arithmetics with big integers, have to implement/use BigInt libraries that work with integers as strings like above. But of course this means that they'll be far slower than the processor. So what I've asked myself is: Why doesn't my processor have a built-in BigInt function? It would work like any other BigInt library, only (a lot) faster and at a lower level: Processor fetches one digit from the cache/RAM, adds it, and writes the result back again. Seems like a fine idea to me, so why isn't there something like that?

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• Python2.7: How can I speed up this bit of code (loop/lists/tuple optimization)?

  - by user89

  I repeat the following idiom again and again. I read from a large file (sometimes, up to 1.2 million records!) and store the output into an SQLite databse. Putting stuff into the SQLite DB seems to be fairly fast. def readerFunction(recordSize, recordFormat, connection, outputDirectory, outputFile, numObjects): insertString = "insert into NODE_DISP_INFO(node, analysis, timeStep, H1_translation, H2_translation, V_translation, H1_rotation, H2_rotation, V_rotation) values (?, ?, ?, ?, ?, ?, ?, ?, ?)" analysisNumber = int(outputPath[-3:]) outputFileObject = open(os.path.join(outputDirectory, outputFile), "rb") outputFileObject, numberOfRecordsInFileObject = determineNumberOfRecordsInFileObjectGivenRecordSize(recordSize, outputFileObject) numberOfRecordsPerObject = (numberOfRecordsInFileObject//numberOfObjects) loop1StartTime = time.time() for i in range(numberOfRecordsPerObject ): processedRecords = [] loop2StartTime = time.time() for j in range(numberOfObjects): fout = outputFileObject .read(recordSize) processedRecords.append(tuple([j+1, analysisNumber, i] + [x for x in list(struct.unpack(recordFormat, fout))])) loop2EndTime = time.time() print "Time taken to finish loop2: {}".format(loop2EndTime-loop2StartTime) dbInsertStartTime = time.time() connection.executemany(insertString, processedRecords) dbInsertEndTime = time.time() loop1EndTime = time.time() print "Time taken to finish loop1: {}".format(loop1EndTime-loop1StartTime) outputFileObject.close() print "Finished reading output file for analysis {}...".format(analysisNumber) When I run the code, it seems that "loop 2" and "inserting into the database" is where most execution time is spent. Average "loop 2" time is 0.003s, but it is run up to 50,000 times, in some analyses. The time spent putting stuff into the database is about the same: 0.004s. Currently, I am inserting into the database every time after loop2 finishes so that I don't have to deal with running out RAM. What could I do to speed up "loop 2"?

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• Can a pc with a 1.2 ghz dual core run VS 2013? [on hold]

  - by moo2

  Edit: This question is about a tool used for programming, Microsoft Visual Studio 2013. I already read the minimum requirements for VS 2013 before I posted or I wouldn't have asked the question. I searched on the web for an answer for a few hours before posting. Why should I go out and spend $400 on a laptop if I can spend less than $100 and use it to learn how to program? In the context of the question it is clear I was not asking for advice on what laptop to buy and it was also clear I was not asking for someone to walk me through the system requirements of VS 2013. This is a vast community and I was wondering if someone in this vast community would have experience in dealing with my question. In other words has anyone ever tried anything like it? If I had an old computer sitting around I would have tested it. At the moment all I have is a friend's Chromebook I'm borrowing. End Edit. I know the requirements for Microsoft Visual Studio 2013 state 1.6 ghz processor. I'm looking at getting a laptop for school and I found one that is old but cheap and would work for college. The Dell D430 I'm looking at getting has a 1.2ghz Core 2 Duo CPU, 80GB HD, 2GB RAM, and Windows 7 Home Premium. It's refurbished. I can get it for less than most phone's cost and from a Microsoft Authorized Refurbisher. I know it's not a skyrim rig but it's lightweight and can handle being a college laptop and doing word processing. Would Visual Studio 2013 run at all? If it is slower I'm not concerned. I just want to know if it would work and compile my assignments and run them? I'd be using this laptop for doing assignments and learning programming languages not for coding the next social media sensation.

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• Fedora 12 Wireless problems (Intel Wireless 4965AGN Card)

  - by Ninefingers

  Hi All, I'm having an interesting experience with my wireless card at the moment. Basically, it does like this: I connect to the local wireless network (netgear router) It works, briefly, allowing me to browse a webpage or maybe two, if I'm lucky. It then stops working / sending any packets, whilst reported still connected. Now, me being me I've had a look to see what I can find. wpa_supplicant.log looks like this: Trying to associate with valid_mac:a2:30 (SSID='vennardwireless' freq=2462 MHz) Associated with valid_mac:a2:30 WPA: Key negotiation completed with valid_mac:a2:30 [PTK=CCMP GTK=TKIP] CTRL-EVENT-CONNECTED - Connection to valid_mac:a2:30 completed (reauth) [id=0 id_str=] CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys So that's working fine. dmesg | grep "*iwl*" spits out this: iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, 1.3.27kds iwlagn: Copyright(c) 2003-2009 Intel Corporation iwlagn 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17 iwlagn 0000:03:00.0: setting latency timer to 64 iwlagn 0000:03:00.0: Detected Intel Wireless WiFi Link 4965AGN REV=0x4 iwlagn 0000:03:00.0: Tunable channels: 13 802.11bg, 19 802.11a channels iwlagn 0000:03:00.0: irq 32 for MSI/MSI-X phy0: Selected rate control algorithm 'iwl-agn-rs' iwlagn 0000:03:00.0: firmware: requesting iwlwifi-4965-2.ucode iwlagn 0000:03:00.0: loaded firmware version 228.61.2.24 Registered led device: iwl-phy0::radio Registered led device: iwl-phy0::assoc Registered led device: iwl-phy0::RX Registered led device: iwl-phy0::TX iwlagn 0000:03:00.0: iwl_tx_agg_start on ra = 00:24:b2:32:a3:30 tid = 0 iwlagn 0000:03:00.0: iwl_tx_agg_start on ra = 00:24:b2:32:a3:30 tid = 0 So that's working too. I can also ping 192.168.0.1 -I wlan0 and arping 192.168.0.1 -I wlan0 the router until the network falls over. uname -r:2.6.32.10-90.fc12.x86_64. Laptop is a Core2 Duo (2Ghz) with 3GB RAM. Other symptoms I've noticed are that wireshark freezes when I capture on the "broken" interface until I disconnect. Am using networkmanager as per normal. Stupidly, I can connect to the same router via eth0/a cat6 cable just fine. Everyone else can connect to the AP fine (from Windows). Yes, I'm sat right next to it and not trying to access a hotspot the other side of the world. Any ideas? Is this a broken update? (I intend to reboot and test an older kernel later)? Anyone else come across this? Edit: iwconfig wlan0 rate auto is the settings I'm using for rates. Also, according to networkmanager the network is still connected. Thanks for any pointers / advice.

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• Windows XP SP3 - Library not registered error... IE8 not installing.

  - by Wesley

  Specs to put things in context: AMD Athlon XP 2400+ @ 1987 MHz / 2 x 512MB PC3200 DDR RAM / WD 160GB IDE HDD / 3DFuzion 128MB GeForce 6200 AGP 4x / FIC AM37 / Windows XP SP3 Just recently, I was unable to start Windows Media Player. I clicked it and the busy cursor came up, but then nothing happened. Also, I tried doing a search for a file, and same thing. It would show busy cursor then suddenly stop doing anything. I couldn't find it in the Processes of the Task Manager. (Perhaps I don't know what I'm looking for?) Also, I was trying to update my DirectX, which has been running something older than DX9 9.0c for a while now, except the installation fails due to "internal error". I think the failed DirectX installation has been like that for a while... (I remember trying to install DX9 9.0c a while back, but still failed.) The Windows programs not starting, I don't think I've ever had before... what could be the cause of these problems?! Thanks in advance. =) EDIT1: Weird thing now is that when I try to open User Accounts, I get a message saying "Wrong number of arguments or invalid property assignment." Also, when I'm trying to open services.msc, I'm getting a script error that says that "Library not registered." (Code: 0, URL: res://C:\WINDOWS\System32\mmcndmgr.dll/views.htm) Perhaps this is related to my other question, where I seemed to have an unregistered library of some sort. EDIT2: The DirectX End-User Runtime Web Installer freakishly worked and updated successfully. Now, I have focussed the question on the bigger problem. For WMP11, H&S, and Search, I click it once, get a busy icon for a second, and then nothing happens. Refer to EDIT1 for other problems. EDIT3: Seems that my problems may be related to some Internet Explorer Script Errors. So what I did was download the IE8 installer from the Microsoft website, but when I run it and get to the main portion of the installer, it just keeps looping on the Downloading step of the installation. The installer is still running, but I left it for at least 4 hours and the downloading step was still not finished. What is the problem? Also, I uninstalled Ubuntu 9.10 after these problems, but they still remain. EDIT4: I'm getting an active desktop recovery background on startup now. And within seconds my computer hangs again. EDIT3 explains main issue though.

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• Windows 7 extremely slow login, exchange performance, printer enumeration, etc...

  - by Jeff

  Background: I have a fresh copy of Windows 7 Professional x64 on a Dell Latitude E6500. The laptop has 8GB RAM, 250GB drive, and all Intel peripherals (net/wifi/graphics). All available Windows updates, as well as hardware drivers are installed. The IT folks where I work joined the computer to our Windows 2003-based Active Directory domain. There are no errors in any logs that we've looked at, and Group Policy templates appear to have applied properly. Problem: Every time I turn on or reboot the computer, it takes between 2 to 10 (all times are actual) minutes after successfully typing my username/password to get to my desktop. My login script does not always run. Sometimes I get a black screen, and a couple of minutes later the login script will pop up and take up to 10 minutes to complete. I can get around this by hitting cntrl-shift-esc and running explorer.exe from the Task Manager. The login script continues to hang, but I can minimize it and go on about my business. Either way, it generally throws errors prior to completing. I often get slow or failed connectivity to Exchange via Outlook. When I bring up printer dialogs, they take several minutes to populate, and block the calling app while doing so. Copies to SMB shares are very slow. On my home network, everything works fine. On both the work network and home network, I can use remote internet resources just fine. Web pages pull up, remote VPN's are fine, I can max out bandwidth on SpeakEasy Speed Test. I can get almost max bandwidth transferring FTP/HTTP over a LAN. Another symptom of the problem is that when I first log in, the work network shows as "Identifying" for a long time in the Network and Sharing Center, and will often then change to the name of the work domain, but say "Unauthenticated Network". Note that this computer previously ran Windows Vista with none of these problems. Attempts to Fix: Installed the Win7 admin pack Uninstalled/reinstalled all hardware drivers Verified Active Directory DNS settings (Vista works relatively well on the same network) Reset all TCP/IP settings on all adapters using the netsh commands to do so Disabled ipv6 on all adapters Disable wifi adapter while on work network Locked the network card to 100/Full, 1000/Full; also tried Auto Added various important addresses to hosts file (exchange, dns, ad) -- removed when didn't help My background is a jpeg (sounds unrelated but there is apparently a win7 login bug related to solid color background) More I have forgotten The IT staff at my company indicated they believe this is due to having Windows 2003 AD servers and not having any Windows 2008 R2 AD servers. Other than that, they have no advice or assistance to offer other than a rebuild (already tried that once with similar symptoms), or downgrade to Vista. Any thoughts out there?

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• Best available technology for layered disk cache in linux

  - by SpliFF

  I've just bought a 6-core Phenom with 16G of RAM. I use it primarily for compiling and video encoding (and occassional web/db). I'm finding all activities get disk-bound and I just can't keep all 6 cores fed. I'm buying an SSD raid to sit between the HDD and tmpfs. I want to setup a "layered" filesystem where reads are cached on tmpfs but writes safely go through to the SSD. I want files (or blocks) that haven't been read lately on the SSD to then be written back to a HDD using a compressed FS or block layer. So basically reads: - Check tmpfs - Check SSD - Check HD And writes: - Straight to SSD (for safety), then tmpfs (for speed) And periodically, or when space gets low: - Move least frequently accessed files down one layer. I've seen a few projects of interest. CacheFS, cachefsd, bcache seem pretty close but I'm having trouble determining which are practical. bcache seems a little risky (early adoption), cachefs seems tied to specific network filesystems. There are "union" projects unionfs and aufs that let you mount filesystems over each other (USB device over a DVD usually) but both are distributed as a patch and I get the impression this sort of "transparent" mounting was going to become a kernel feature rather than a FS. I know the kernel has a built-in disk cache but it doesn't seem to work well with compiling. I see a 20x speed improvement when I move my source files to tmpfs. I think it's because the standard buffers are dedicated to a specific process and compiling creates and destroys thousands of processes during a build (just guessing there). It looks like I really want those files precached. I've read tmpfs can use virtual memory. In that case is it practical to create a giant tmpfs with swap on the SSD? I don't need to boot off the resulting layered filesystem. I can load grub, kernel and initrd from elsewhere if needed. So that's the background. The question has several components I guess: Recommended FS and/or block layer for the SSD and compressed HDD. Recommended mkfs parameters (block size, options etc...) Recommended cache/mount technology to bind the layers transparently Required mount parameters Required kernel options / patches, etc..

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• Xen won't start after it had been working

  - by Paul Tomblin

  I've been setting up this Debian Stable system with a dom0 and 3 domUs. It was working fine for several days, and I'm almost ready to deploy it to the rack. But last night I shut it down with all three domUs still running for the first time, and today when I started it up, xend won't start. In /var/log/messages, I have: Apr 18 13:01:33 xen-test BLKTAPCTRL[4248]: blktapctrl: v1.0.0 Apr 18 13:01:33 xen-test BLKTAPCTRL[4248]: Found driver: [raw image (aio)] Apr 18 13:01:33 xen-test BLKTAPCTRL[4248]: Found driver: [raw image (sync)] Apr 18 13:01:33 xen-test BLKTAPCTRL[4248]: Found driver: [vmware image (vmdk)] Apr 18 13:01:33 xen-test BLKTAPCTRL[4248]: Found driver: [ramdisk image (ram)] Apr 18 13:01:33 xen-test BLKTAPCTRL[4248]: Found driver: [qcow disk (qcow)] Apr 18 13:01:33 xen-test BLKTAPCTRL[4248]: couldn't find device number for 'blktap0' Apr 18 13:01:33 xen-test BLKTAPCTRL[4248]: Unable to start blktapctrl and in /var/log/xen/xend.log, I have this: [2010-04-18 12:46:32 3523] INFO (SrvDaemon:219) Xend exited with status 1. [2010-04-18 13:01:34 4255] INFO (SrvDaemon:331) Xend Daemon started [2010-04-18 13:01:34 4255] INFO (SrvDaemon:335) Xend changeset: unavailable. [2010-04-18 13:01:34 4255] INFO (SrvDaemon:342) Xend version: Unknown. [2010-04-18 13:01:34 4255] ERROR (SrvDaemon:353) Exception starting xend (no element found: line 1, column 0) Traceback (most recent call last): File "/usr/lib/xen-3.2-1/lib/python/xen/xend/server/SrvDaemon.py", line 345, in run servers = SrvServer.create() File "/usr/lib/xen-3.2-1/lib/python/xen/xend/server/SrvServer.py", line 251, in create root.putChild('xend', SrvRoot()) File "/usr/lib/xen-3.2-1/lib/python/xen/xend/server/SrvRoot.py", line 40, in __init__ self.get(name) File "/usr/lib/xen-3.2-1/lib/python/xen/web/SrvDir.py", line 82, in get val = val.getobj() File "/usr/lib/xen-3.2-1/lib/python/xen/web/SrvDir.py", line 52, in getobj File "/usr/lib/xen-3.2-1/lib/python/xen/xend/server/SrvNode.py", line 30, in _ _init__ self.xn = XendNode.instance() File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendNode.py", line 709, in instance inst = XendNode() File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendNode.py", line 164, in __init__ saved_pifs = self.state_store.load_state('pif') File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendStateStore.py", line 104, in load_state dom = minidom.parse(xml_path) File "/usr/lib/python2.5/xml/dom/minidom.py", line 1915, in parse return expatbuilder.parse(file) File "/usr/lib/python2.5/xml/dom/expatbuilder.py", line 924, in parse result = builder.parseFile(fp) File "/usr/lib/python2.5/xml/dom/expatbuilder.py", line 211, in parseFile parser.Parse("", True) ExpatError: no element found: line 1, column 0 [2010-04-18 13:01:34 4253] INFO (SrvDaemon:219) Xend exited with status 1. Any clues as to what might be going wrong?

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• Ubuntu suddenly freezes

  - by tapan

  I've a strange problem with my ubuntu 10.04 installation. Whenever i boot into ubuntu the entire system freezes / hangs soon after (~ 2 mins in). This problem exists on my windows 7 installation too. However if i start World of Warcraft or Warcraft on windows it doesnt hang for the duration i'm playing the game. After i stop playing and exit the game my laptop hangs inside 2 mins. Here is when it gets weirder. If i disconnect the charger, the laptop doesn't hang. However when I start it in ubuntu recovery mode and drop to root shell and use the 'startx' command everything works perfectly. I cannot figure out what the problem is. i have an intel core2duo 2.2ghz processor, intel mobile 965 graphics, 2 GB RAM for more details here is the output of cat /proc/cpuinfo : processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz stepping : 11 cpu MHz : 2201.000 cache size : 4096 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida tpr_shadow vnmi flexpriority bogomips : 4389.80 clflush size : 64 power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz stepping : 11 cpu MHz : 2201.000 cache size : 4096 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida tpr_shadow vnmi flexpriority bogomips : 4388.96 clflush size : 64 power management: here is the output of cat /proc/meminfo MemTotal: 2052440 kB MemFree: 55924 kB Buffers: 579352 kB Cached: 821752 kB SwapCached: 704 kB Active: 897124 kB Inactive: 1032256 kB Active(anon): 412140 kB Inactive(anon): 264804 kB Active(file): 484984 kB Inactive(file): 767452 kB Unevictable: 0 kB Mlocked: 0 kB HighTotal: 1178440 kB HighFree: 6012 kB LowTotal: 874000 kB LowFree: 49912 kB SwapTotal: 995988 kB SwapFree: 986616 kB Dirty: 8928 kB Writeback: 0 kB AnonPages: 527596 kB Mapped: 76536 kB Slab: 39480 kB SReclaimable: 21100 kB SUnreclaim: 18380 kB PageTables: 5672 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 2022208 kB Committed_AS: 1856400 kB VmallocTotal: 122880 kB VmallocUsed: 11928 kB VmallocChunk: 104644 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 4096 kB DirectMap4k: 16376 kB DirectMap4M: 892928 kB Also the kern.log doesn't show any errors. What I want to know is what might be the problem, how i could test for it and if there are any solutions I could try. Thanks :).

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• iSCSI timeouts under high load

  - by Antonio

  I have two servers connected via Gigabit Ethernet. One is iSCSI target, the second one is initiator. When I run mkfs.ext4 at initiator, after a while disk IO slows down critically. In the target host I can see the following in syslog: Sep 14 09:40:03 sh11 tgtd: abort_task_set(1139) found 119668c 0 Sep 14 09:40:03 sh11 tgtd: abort_cmd(1115) found 119668c 6 Sep 14 09:40:03 sh11 tgtd: abort_task_set(1139) found 119668d 0 Sep 14 09:40:03 sh11 tgtd: abort_cmd(1115) found 119668d 6 Sep 14 09:40:03 sh11 tgtd: abort_task_set(1139) found 119668e 0 Sep 14 09:40:03 sh11 tgtd: abort_cmd(1115) found 119668e 6 Sep 14 09:40:03 sh11 tgtd: abort_task_set(1139) found 1196696 0 Sep 14 09:40:03 sh11 tgtd: abort_cmd(1115) found 1196696 6 Sep 14 09:40:03 sh11 tgtd: abort_task_set(1139) found 119669e 0 Sep 14 09:40:03 sh11 tgtd: abort_cmd(1115) found 119669e 6 Sep 14 09:40:04 sh11 tgtd: abort_task_set(1139) found 119669f 0 Sep 14 09:40:04 sh11 tgtd: abort_cmd(1115) found 119669f 6 And load average grows to 12 or even more: # uptime 12:37:00 up 23 days, 13:25, 1 user, load average: 12.00, 7.00, 4.00 CentOS 6.3 tgtd 1.0.24 Intel Pentium 4 2.4GHz 1Gb RAM 2Tb WD Cavlar Green SATA 2.0 #lspci 00:00.0 Host bridge: Intel Corporation 82845G/GL[Brookdale-G]/GE/PE DRAM Controller/Host-Hub Interface (rev 02) 00:01.0 PCI bridge: Intel Corporation 82845G/GL[Brookdale-G]/GE/PE Host-to-AGP Bridge (rev 02) 00:1d.0 USB controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 02) 00:1d.1 USB controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 02) 00:1d.2 USB controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 02) 00:1d.7 USB controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller (rev 02) 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 82) 00:1f.0 ISA bridge: Intel Corporation 82801DB/DBL (ICH4/ICH4-L) LPC Interface Bridge (rev 02) 00:1f.1 IDE interface: Intel Corporation 82801DB (ICH4) IDE Controller (rev 02) 00:1f.3 SMBus: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) SMBus Controller (rev 02) 00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 02) 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV200 QW [Radeon 7500] 02:01.0 Ethernet controller: D-Link System Inc DGE-530T Gigabit Ethernet Adapter (rev 11) (rev 11) 02:02.0 RAID bus controller: VIA Technologies, Inc. VT6421 IDE/SATA Controller (rev 50) 02:03.0 RAID bus controller: VIA Technologies, Inc. VT6421 IDE/SATA Controller (rev 50) 02:04.0 RAID bus controller: Silicon Image, Inc. SiI 3114 [SATALink/SATARaid] Serial ATA Controller (rev 02) 02:08.0 Ethernet controller: Intel Corporation 82801DB PRO/100 VE (CNR) Ethernet Controller (rev 82) Is there a way to tune target host to avoid these timeouts?

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• Random servers in Citrix servers suddenly bluescreens (mostly 0x0000008e and 0x0000007e)

  - by Rasmus Rask

  I'm responsible for a Citrix Presentation Server 4.5 farm. Starting Friday 30. November, my servers started to crash randomly. So far we've experienced 80 crashes, so it's obviously becoming an increasingly big problem for us. I have 12+ years experience with IT, so I know the difference between 0 and 1, but I have a hard time cracking this. We've rolled back any recent changes I can think of for different groups of servers, but all groups still seem to crash. I don't have the skills to interpret the memory dumps to find the culprit. Has anyone encountered the same or a similar problem? - might be a generic Windows issue Other than executing "analyze -v" in WinDbg, how do I work my way through the memory dumps to see what actually triggered the BSOD? Any suggested steps in getting to the bottom of this? Any help is greatly appreciated. I can also provide links to kernel memory dumps or WinDbg output if necessary. Thanks! Problem description The majority of the STOP errors we encounter are: 0x0000008e KERNEL_MODE_EXCEPTION_NOT_HANDLED (50%) 0x0000007e SYSTEM_THREAD_EXCEPTION_NOT_HANDLED (26%) 0x00000050 PAGE_FAULT_IN_NONPAGED_AREA (21%) We also see a few 0x0000000a IRQL_NOT_LESS_OR_EQUAL (3%). For both 0x0000008e and 0x0000007e bug checks, the exception code is 0xc0000005 (Access Violation). When opening dump files in WinDbg, most details are exactly the same, for all the 0x0000008e and 0x0000007e bug checks respectively: 0x0000008e Exception address: 0x808bc9e3 Trap frame: [varies] FAILURE_BUCKET_ID: 0x8E_nt!HvpGetCellMapped+97 Probably Caused by (IMAGE_NAME): ntkrpamp.exe 0x0000007e Exception address: 0x808369b6 Exception record address: 0xf70d3be0 Context record address: 0xf70d38dc FAILURE_BUCKET_ID: 0x7E_nt!MmPurgeSection+14 Probably Caused by: memory_corruption About 30% of the crashes happens between 17:00 and 19:00, which leads me to believe this tend to happen more often during logoffs. But then again, only ~15% occurs between 15:00 and 17:00. Summary of farm Citrix Presentation Server 4.5 R06 on Windows Server 2003 R2 SP2 All high priority patches, at least as of October installed Virtualized using VMWare ESX/vSphere 4.1 on HP Proliant BL460c G6 blade servers About 53 Presentation Servers in production, divided into three silos - only one of which, the largest, is affected 2 vCPU's (5 GHz reserved), 8 GB RAM (all reserved) for each Presentation Server Plenty of free disk space Very few printer drivers - automated deletion of non-approved drivers every night ~1.000 peak concurrent users, which is reached at around 10:30 (on weekdays) Number of sessions steadily decline between 15:00 and 19:00 to ~230

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• Firefox 3.5.6 causes entire computer to freeze

  - by Anthony Aziz

  Here's the situation: Environment: Just installed a fresh copy of Win7 Pro 32-bit to NTFS partition on 750GB SATA drive Hardware: E8400 3GHz ASUS P5QL Pro 4GB DDR2 1066 RAM EVGA 9800 GTX+ Plenty of cooling, no problems with hardware before Data is stored on a separate partition, including My Documents No security software is yet installed No extensions installed yet Problem: While using Firefox, sometimes the entire computer will freeze/hang. I get no mouse or keyboard input, can't CTRL+ALT+DEL, no "not responding" indication, just a static image on my display. My drivers are all up to date as far as I'm aware (I just installed this copy of Windows last week). I first noticed this when trying to install Xmarks. I went to the Xmarks site and tried to install and it would freeze. I managed to get it installed (Safe mode and the Mozilla addon site worked), but when I go to configure it (log in, etc), the computer freezes. I don't think it's a matter of usage time or memory issues, because while testing, I browsed wallpaper galleries for about 30 minutes, sometimes as many as 12-15 tabs open at a time, without issue. Sometimes I won't even try to install Xmarks at it will hang. I can install (some) other extensions, the only one I've tried is download status bar (which works). What I've done to try to fix: Restarted (duh) Windows safe mode Completely remove Firefox and install it to a new directory, according to Mozilla's KB (I haven't tried the profile manager, though I assume this does the same thing, except perhaps more thoroughly) Some BIOS changes, including Power options, disabling oveclocking (it was a modest overclock on the CPU, which has run Win7 beta and RC for almost a year now) Memtest Used another Windows user profile, same tragic results I'm STUCK now, with no idea what to do. I'm using Chrome as my main browser at the moment, but that's not something I want to be stuck with. I like Firefox and want to use it. I'm going to try creating a new profile first. One thing I did notice: I started leaving task manager and performance monitor open when anticipating (but dreading) a freeze. firefox.exe had low CPU and low memory, but it looked like overall disk usage was seeing some spikes on the small graph Performance Monitor gives you. I saw on one blog post a fellow using XP moved his Local Settings directory from a separate drive to his main drive, and that solved it, but I don't think my AppData directory is on my D: drive, and that's on the same physical device anyways. Still, something that might be worth trying. I'd extremely appreciate any help. Thanks very much. I really don't want to reinstall Windows from scratch again :( Anthony Aziz

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• swapping or thrashing with vast amounts of unmapped pagecache

  - by Marco

  EDIT: I noticed that this is more appropriate for superuser.com, I apologize. I don't know how to delete this question. I'm using kubuntu jaunty (i386 32bit), kernel 2.6.28-13-generic. I've 4Gb of RAM, of which only 3317Mb are seen by the system (I guess because of the 32bit system). I'm seeing that the pagecache utilization is continually growing, up to the point that the system is unusable (after a few days). This happens also when I don't do anything (all user applications closed and the bare minimum of services enabled). If enabled, the system starts to use swap space (using it all in the end). Even if swap is disabled, disk activity becomes continuous, with the system unresponsive. For example, right now the system is working (albeit a tad slow), with only firefox and wing ide running, and I have 2Gb cached with only 45Mb mapped: $ free total used free shared buffers cached Mem: 3346388 3247328 99060 0 8416 2117980 -/+ buffers/cache: 1120932 2225456 Swap: 2144668 519448 1625220 $ cat /proc/meminfo MemTotal: 3346388 kB MemFree: 97128 kB Buffers: 7872 kB Cached: 2120224 kB SwapCached: 413860 kB Active: 2304596 kB Inactive: 865984 kB Active(anon): 2279168 kB Inactive(anon): 830236 kB Active(file): 25428 kB Inactive(file): 35748 kB Unevictable: 32 kB Mlocked: 32 kB HighTotal: 2492940 kB HighFree: 5456 kB LowTotal: 853448 kB LowFree: 91672 kB SwapTotal: 2144668 kB SwapFree: 1625244 kB Dirty: 84 kB Writeback: 0 kB AnonPages: 629304 kB Mapped: 45768 kB Slab: 45600 kB SReclaimable: 21756 kB SUnreclaim: 23844 kB PageTables: 4468 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 3817860 kB Committed_AS: 3735020 kB VmallocTotal: 122880 kB VmallocUsed: 9352 kB VmallocChunk: 66600 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 4096 kB DirectMap4k: 16376 kB DirectMap4M: 888832 kB If I try to drop the caches, little happes: # sync ; echo 3 > /proc/sys/vm/drop_caches ; free total used free shared buffers cached Mem: 3346388 3220580 125808 0 3020 2100600 -/+ buffers/cache: 1116960 2229428 Swap: 2144668 519356 1625312 Right now I've vm.swappiness = 5, but I've tried also with 0 and 1 (without noticeable differences). I've also tried vm.vfs_cache_pressure = 50 and 150 (again, no differences). As I said the pagecache eats all memory even with swapping turned off. What is happening? How to avoid this? TIA, Marco

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• Double Layer DVD+R burning problem - I/O Error

  - by Mehper C. Palavuzlar

  I have a modern PC (Quad Core CPU, 4 GB RAM, Win7 Home Premium 64-bit) but I have a problem with burning .dvd images to Double Layer (8.5 GB) DVDs. I wasted too many DVD+R DL discs but to no avail. Here is a short explanation of what I did: I'm using ImgBurn v2.5.0.0 (latest version). I'm trying to burn an image file (.dvd) which is together with the related .iso file in the same folder. In ImgBurn, I select the file with .dvd extension, and set writing speed to 2.4x. Burning process starts normally, but around 7% of the process, it gives a I/O Write Error, which is as follows: I wasted 3 discs (Magic, Made in Taiwan, DVD+R DL, 8.5 GB) trying the same thing. My DVD writer is LG GH22NP20 with IDE connection type. I updated its firmware from 1.04 to 2.00 but no success in burning again. Then my cousin brought his LG (an older model) which, he claims, was successful in writing DL discs with the same brand (Magic). I plugged off my LG and plugged the older one in, and tried to burn the image again. It also gave an I/O Error even without standing till 7%. I tried another burning program (CloneCD), but failed again. Then I bought other brands (TDK and VERBATIM) and tried to burn the image. Burning process started successfully, but around 14% (for Verbatim) and 25% (for TDK) failed again. Here is a screeny from ImgBurn: I've burned lots of 4.7 GB DVD+Rs and DVD-Rs successfully, even without a single error, with this LG DVD writer, but this case is very bothering for me. What should I do? Should I buy a new DVD writer other than LG? Could this be related to Windows or my hardware configuration? Thanks for your help. Edit: My burner works on my cousin's machine. So the problem must be related to my system. What could be the reason? Latest news: I borrowed an external USB DVD writer from a friend, which is PHILIPS SPD3000CC (an old model). Guess what! It's burning DVD+R DLs successfully! How come an internal DVD writer of a brand new computer system cannot burn DL DVDs? Now I'm considering buying a new internal DVD writer with not IDE, but SATA connection...

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• Ubuntu/Windows suddenly freezes

  - by tapan

  I've a strange problem with my ubuntu 10.04 installation. Whenever i boot into ubuntu the entire system freezes / hangs soon after (~ 2 mins in). This problem exists on my windows 7 installation too. However if i start World of Warcraft or Warcraft on windows it doesnt hang for the duration i'm playing the game. After i stop playing and exit the game my laptop hangs inside 2 mins. Here is when it gets weirder. If i disconnect the charger, the laptop doesn't hang. However when I start it in ubuntu recovery mode and drop to root shell and use the 'startx' command everything works perfectly. I cannot figure out what the problem is. i have an intel core2duo 2.2ghz processor, intel mobile 965 graphics, 2 GB RAM for more details here is the output of cat /proc/cpuinfo : processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz stepping : 11 cpu MHz : 2201.000 cache size : 4096 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida tpr_shadow vnmi flexpriority bogomips : 4389.80 clflush size : 64 power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Core(TM)2 Duo CPU T7500 @ 2.20GHz stepping : 11 cpu MHz : 2201.000 cache size : 4096 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm ida tpr_shadow vnmi flexpriority bogomips : 4388.96 clflush size : 64 power management: here is the output of cat /proc/meminfo MemTotal: 2052440 kB MemFree: 55924 kB Buffers: 579352 kB Cached: 821752 kB SwapCached: 704 kB Active: 897124 kB Inactive: 1032256 kB Active(anon): 412140 kB Inactive(anon): 264804 kB Active(file): 484984 kB Inactive(file): 767452 kB Unevictable: 0 kB Mlocked: 0 kB HighTotal: 1178440 kB HighFree: 6012 kB LowTotal: 874000 kB LowFree: 49912 kB SwapTotal: 995988 kB SwapFree: 986616 kB Dirty: 8928 kB Writeback: 0 kB AnonPages: 527596 kB Mapped: 76536 kB Slab: 39480 kB SReclaimable: 21100 kB SUnreclaim: 18380 kB PageTables: 5672 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 2022208 kB Committed_AS: 1856400 kB VmallocTotal: 122880 kB VmallocUsed: 11928 kB VmallocChunk: 104644 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 4096 kB DirectMap4k: 16376 kB DirectMap4M: 892928 kB Also the kern.log doesn't show any errors. What I want to know is what might be the problem, how i could test for it and if there are any solutions I could try. Thanks :).

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• WSUS appears to be functioning, however errors are reported in Application Log (DSS Authentication W

  - by Richard Slater

  I re-installed WSUS a few months ago on a new server as part of a server hardware refresh. It is functioning normally downloading, authorizing and supplying patches to workstations. System Specification: HP DL360 G5 Quad 2.5 Zeon 6GB RAM Not Virtualized WSUS 3.2.7600.3226 SQL 2005 Express Windows 2003 R2 SP2 WSS SSL Enabled Every six hours five events are logged to the Application Event Log: Source | Category | ID | Description -------------------------------------------------------------------------------------- Windows Server Update Services | Web Services | 12052 | The DSS Authentication Web Service is not working. Windows Server Update Services | Web Services | 12042 | The SimpleAuth Web Service is not working Windows Server Update Services | Web Services | 12022 | The Client Web Service is not working Windows Server Update Services | Web Services | 12032 | The Server Synchronization Web Service is not working Windows Server Update Services | Web Services | 12012 | The API Remoting Web Service is not working In addition the following .NET Stack Trace is logged in C:\Program Files\Update Services\LogFiles\SoftwareDistribution.log each stack trace is identical except for the names of the services: 2009-11-27 11:56:52.757 UTC Error WsusService.10 HmtWebServices.CheckApiRemotingWebService ApiRemoting WebService WebException:System.Net.WebException: The request failed with HTTP status 403: Forbidden. at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall) at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) at Microsoft.UpdateServices.Internal.ApiRemoting.Ping(Int32 pingLevel) at Microsoft.UpdateServices.Internal.HealthMonitoring.HmtWebServices.CheckApiRemotingWebService(EventLoggingType type, HealthEventLogger logger) at Microsoft.UpdateServices.Internal.HealthMonitoring.HmtWebServices.CheckApiRemotingWebService(EventLoggingType type, HealthEventLogger logger) at Microsoft.UpdateServices.Internal.HealthMonitoring.HealthMonitoringTasks.ExecuteSubtask(HealthMonitoringSubtask subtask, EventLoggingType type, HealthEventLogger logger) at Microsoft.UpdateServices.Internal.HealthMonitoring.HmtWebServices.Execute(EventLoggingType type) at Microsoft.UpdateServices.Internal.HealthMonitoring.HealthMonitoringTasks.Execute(EventLoggingType type) at Microsoft.UpdateServices.Internal.HealthMonitoring.HealthMonitoringThreadManager.Execute(Boolean waitIfNecessary, EventLoggingType loggingType) at Microsoft.UpdateServices.Internal.HealthMonitoring.RemotingChannel.PrivateLogEvents() at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInContext, Object[]& outArgs) at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg, Int32 methodPtr, Boolean fExecuteInContext) at System.Runtime.Remoting.Messaging.ServerObjectTerminatorSink.SyncProcessMessage(IMessage reqMsg) at System.Runtime.Remoting.Lifetime.LeaseSink.SyncProcessMessage(IMessage msg) at System.Runtime.Remoting.Messaging.ServerContextTerminatorSink.SyncProcessMessage(IMessage reqMsg) at System.Runtime.Remoting.Channels.CrossContextChannel.SyncProcessMessageCallback(Object[] args) at System.Runtime.Remoting.Channels.ChannelServices.DispatchMessage(IServerChannelSinkStack sinkStack, IMessage msg, IMessage& replyMsg) at System.Runtime.Remoting.Channels.SoapServerFormatterSink.ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream requestStream, IMessage& responseMsg, ITransportHeaders& responseHeaders, Stream& responseStream) at System.Runtime.Remoting.Channels.BinaryServerFormatterSink.ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream requestStream, IMessage& responseMsg, ITransportHeaders& responseHeaders, Stream& responseStream) at System.Runtime.Remoting.Channels.Ipc.IpcServerTransportSink.ServiceRequest(Object state) at System.Runtime.Remoting.Channels.SocketHandler.ProcessRequestNow() at System.Runtime.Remoting.Channels.SocketHandler.BeginReadMessageCallback(IAsyncResult ar) at System.Runtime.Remoting.Channels.Ipc.IpcPort.AsyncFSCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOverlapped) at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP) So far I have tried the following: Ensuring the settings were accurate as per TechNet. Checked that there was a suitable binding to 127.0.0.1 binding in IIS. Gone through and checked the settings in IIS as per TechNet. I have discovered that you can run the command wsusutil checkhealth to force the healt check to run, wsusutil can be found in C:\Program Files\Update Services\Tools. When this executese it will tell you to check the application log.

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