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• tcpdump selective acknowledgements question

  - by wlaus

  Hi All, I eventually sometimes watch most initial tcp connection attempts like this: tcpdump -nn -Z somepcapuser not src host (12x.x5.109.xxx or 62.75.160.xxx ) and not (port 9001 or 443 or 8080 ) and tcp[tcpflags]&(tcp-syn) !=0 and not tcp[tcpflags]& (tcp-ack) !=0 or icmp this works pretty well to quickly identify oddness so far. However, I now have a question on the following output: 03:53:52.227884 IP 203.81.166.20.53786 62.75.160.xxx.80: S 846930886:846930886(0) win 61690 "<"mss 1460,nop,nop,sackOK,opt-178:f04700000000,nop,wscale 4"" I wonder what the marked portion means, haven't seen that before. Thanks for help wlaus

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• Problems with chip fan and CPU fan

  - by JS Bangs

  I have a five-year-old ASUS motherboard that has been working fine for me for years, until I attempted to power it on yesterday and got a CPU fan speed and chip fan speed warning. Cracking open the case and powering the computer on, I can see the chip fan working, but it appears to be hitting something as it makes a very loud buzzing noise. The CPU fan, meanwhile, starts up when I power on, but slows down and stops after a few seconds! How can I address these problems? Is there any way to fix these sort of fan speed issues without just replacing the fan (which in the case of the chip fan, probably means replacing the whole motherboard)?

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• EC2 custom topology

  - by Methos

  Is there any way to create a desired topology of EC2 instances? For example, can I create a 3 node topology of nodes A, B, C where C gets the public IP address and B and A are connected to it. Something like: Internet <-- C <-- B <-- A B and A only get private IP addresses and there is no way for the traffic to reach A before hitting B and C. This means I can install whatever I want to install on C and B to filter, cache etc. I'm going through EC2 documentation but so far I have not seen anything that talks about it. I will really appreciate if anyone knows how to do this on EC2

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• Varnish Running VCC-compiler failed on purge

  - by FLX

  I've been following this guide which uses this default.vcl. However, when starting Varnish I get the following error: * Starting HTTP accelerator [fail] storage_malloc: max size 1024 MB. Message from VCC-compiler: Expected '(' got ';' (program line 341), at (input Line 43 Pos 22) purge; ---------------------# Running VCC-compiler failed, exit 1 VCL compilation failed Which means that there is something wrong with purge here: sub vcl_hit { if (req.request == "PURGE") { purge; error 200 "Purged."; } } I don't see anything wrong, can someone explain? Thanks!

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• Macbook pro asks me to "Service Battery"

  - by Uwe Honekamp

  A couple of weeks ago I checked the battery and at that point in time (after 160 load cycles) it still had a capacity of 5000 mAh. Today, my 2006 macbook pro tells me via the battery menu to "Service Battery". According to Coconut Battery the current capacity is only 1590 mAh. The corresponding help text suggests contacting an Apple Authorized Service Provider (AASP) to have the computer checked. Before I decide to throw money at the AASP I'd like to understand what the AASP could possibly do to eliminate the problem. Isn't it more likely that the battery simply broke at 160 cycles and needs to be replaced? Are there any means by software or firmware to influence battery behavior? Of course, the computer hardware might be broken but how could this result in the described effect? And yes, I'm currently trying a calibration cycle but I have some doubts that it will save the day.

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• What does the suffix 'w' and 'd' mean with 'TIME+' in top?

  - by ssapkota

  Here's a chunk of the top from my server: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 18878 www-data 20 0 200m 13m 4704 S 0 0.2 0:00.07 apache2 12374 root 20 0 197m 9460 4480 S 0 0.1 21212906w apache2 9136 root 20 0 79100 3488 2716 S 0 0.0 54518724d sshd I know the TIME+ means the total CPU time the task has used since it started. But in the above output, I simply couldn't understand what 21212906w and 54518724d mean? some considerable no of processes are showing the TIME+ with w and d prefixed. What does this mean? Is the server in trouble? Just to let you know - the server uptime is 4days. EDIT: - I can guess these refer week and days. If so why is it so large considering the uptime? - The server has 8 cores.

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• ISPConfig 3 SSL automatic rewrite

  - by lol

  I was wondering how you could get apache2 to redirect http://server.com:8080 to https://server.com:8080 - I have an ISPConfig 3 setup and the http://server.com:8080 virtual host currently prints a 400 back request error given that I've tried adding RewriteEngine on RewriteCond %{HTTPS} !^on$ [NC] RewriteRule . https://%{HTTP_HOST}:8080%{REQUEST_URI} [L] to the ispconfig.vhost file (and reloading the conf) with no success --edit!-- I've been playing around with it and adding an 'always redirect to google' into the ispconfig vhost and it works once you've already started talking ssl to it. this means the non-ssl connections are getting 'bad request errors' before the vhost is loaded... but where...? --edit 2!-- nope, the ssl is handled exclusively by the virtual host - if I turn off the ssl engine then the rewriting works perfectly (but obviously there is no ssl at https://) thanks!

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• Server vendor that allows 3rd party disks

  - by Alvin S

  As noted here, Dell is no longer allowing 3rd party disks to be used with their latest servers. As in, they don't work period. Which means that if you buy one of these boxes and want to upgrade the storage later, you have buy disks from Dell at significant premiums. Dell has just given me a very strong reason to take my server business elsewhere. My company buys (instead of leasing) our servers, and typically uses them for 5 years. I need to be able to upgrade/repurpose storage periodically, and do not want to be locked in to whatever Dell might have in stock, at inflated prices to boot. As you will see in the comments of the above link, it seems HP is doing the same thing. I am looking for a server vendor that offers 3-5 year warranty with same day/next day onsite service, and allows me to use 3rd party disks. Suggestions?

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• Windows Server firewall asking for advice

  - by George2

  Hello everyone, I have Windows Server 2003/2008 machine, and I deployed some application on this machine. I want to put this machine in a sandbox environment, which means I want this machine to be able to access only proxy/gateway, its private used SQL Server database server, and I want to avoid network access from this machine to other machines in lab server room. Any easy solutions? BTW: my current environment is, I have a server which runs some Beta software in a Lab server room. It connects internet through proxy/gateway. Since the software is Beta, I want to reduce the risk of being hacked from internet and controlled by hacking sofwtare to attack my other servers in the same Lab server. thanks in advance, George

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• performance of vmware-machine on different computers

  - by bxshi

  I'm working on a filesystem improving project, and found a paper says the cheating on benchmark, and it gives a solution that use VMs could help others to reproduce our result. And the question is, if I have made a specific vmware virtual machine, will it runs the same at different computer and platform? For example, I have a virtual machine which is 1G RAM, 4G HD and 2G one-core CPU. Will that runs the same at a qual-core 3G CPU and a 2.4G P4? What if the computer have 4G RAM? Will vmware use some buffer mechanism to improve performance? If that's true, does it means the VM runs on a 2G RAM host will slower than on a 4G host? Hope you can help me on that, or just told me where could I find the answer.

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• Can I be a wireless server WITHOUT offering internet?

  - by Kenny Hendrick

  I would like to pull into a truck stop and offer a folder of free documentaries to quell some of the ignorance LOL I run Linux ";-) Very happy to have made that switch by the way...and have an internal wireless in the laptop but my bus has an antenna on the roof which I connect via usb to create a wireless signal (this is the one I'd like to focus on since it will offer the most reach to all those truckers out there. My question is this. I'm running apache2 and have a bunch of videos tossed into the www folder and can access it locally and would like others that frown on paying to use the truckstops slow internet service and would like an alternative by simply logging onto me and getting the narrow content I offer freely without passwords and the like. Has anyone a good means of doing this? p.s. I've done this in the past but am getting old and forgetful (my crutch)

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• Understanding this error: apr_socket_recv: Connection reset by peer (104)

  - by matthewsteiner

  So, if I do some benchmarking with apache benchmark (ab), and I use large numbers of requests. Then sometimes in the middle of a test I get this error. I don't even know what it means. So how can I fix it? Or is it just something that will happen if the server gets too many hits anyway? The problem is, if I run 10,000 hits, it'll all run perfectly. If I run it again, it'll get to 4000 and get the error: apr_socket_recv: Connection reset by peer (104) A little about my setup: I have nginx taking static requests and processing dynamic ones to apache. The file in question is served from cache by nginx, so I guess it's probably got to do with how nginx is handling the requests? Ideas?

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• How to PERMANENTLY disable touchpad tap-to-click on Dell Inspiron/Windows 7

  - by Graham

  Hi all - my first time here, so I hope you can help. I've seen a lot of stuff on various forums (including here) about disabling the annoying "tap" function on a laptop touchpad. I learned the hard way not to de-install the driver (as the software suggests), since you then loose the Synaptic tab in the mouse control settings, and with it all means to modify the touchpad settings ... indicentally, if this happens to you, reboot in safe mode and do a restore, and the synaptic tab comes back. Not ideal, I know, but it works. Anyway, I have the most up-to-date drivers, and I can go to the Synaptics tab and can disable the tap-to-click function no problem. However, next time the machine is booted, tap-to-click is back on. It can alsways be disabled, but it's pain having to reset it every time the mchine is powered up. Is there a way to permanently disable it, once and for all? Thanks in advance, Graham

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• Changing Windows public folder in batch script.

  - by Angus

  I've installed Steam on an external hard drive so I can play games on different computers by just moving the drive around. Since save games are often saved in My Documents or AppData, but I want them to move with the external hard drive, I wrote a batch file that sets environment variables before starting steam. setocal set USERPROFILE=%EXTERNAL_LETTER%\Profile\Me set APPDATA=%USERPROFILE%\AppData\Roaming ... start %TARGETAPP% endlocal I'm not sure if this is the right way to do this on Windows, but it seems to work. However, one game saves its games in the Shared Documents folder. I've tried setting %PUBLIC% and %ALLUSERSPROFILE% but that does not seem to affect where the game looks. Is it possible to make this one program use a different Shared Documents folder, either by environment variables or some other means? The change in Shared Documents should only affect the one program, I do not want it to be a permanent or system wide change to Windows.

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• SSLCipherSuite - disable weak encryption, cbc cipher and md5 based algorithm

  - by John

  A developer recently ran a PCI Scan with TripWire against our LAMP server. They identified several issues and instructed the following to correct the issues: Problem: SSL Server Supports Weak Encryption for SSLv3, TLSv1, Solution: Add the following rule to httpd.conf SSLCipherSuite ALL:!aNULL:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM Problem: SSL Server Supports CBC Ciphers for SSLv3, TLSv1 Solution: Disable any cipher suites using CBC ciphers Problem: SSL Server Supports Weak MAC Algorithm for SSLv3, TLSv1 Solution: Disable any cipher suites using MD5 based MAC algorithms I tried searching google for a comprehensive tutorial on how to construct an SSLCipherSuite directive to meet my requirements, but I didn't find anything I could understand. I see examples of SSLCipherSuite directives, but I need an explanation on what each component of the directive does. So even in the directive SSLCipherSuite ALL:!aNULL:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM, I dont understand for example what the !LOW means. Can someone either a) tell me the SSLCipherSuite directive that will meet my needs or b) show me a resource that clearly explains each segment of a SSLCipherSuite is and how to construct one?

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• Should websites live in /var/ or /usr/ according to recommended usage?

  - by nbolton

  According to a guide on the Linux directory structure, /usr/ is for application files, and /var/ is for files that change (I assume this means "files that belong to the applications"). Is this correct? If this is the case then I'm a little torn between using either. A website is an application (if it's dynamic, so to speak), but in other cases it is just a collection of files used by Apache. The default www dir lives in /var/www/, so should we follow suit by using /var/websites/ (or something similar), or choose /usr/websites/ since they could be applications? This is a very trivial question, but it's bugging me nonetheless. For our case, I'm leaning toward /usr/web or something like that, since our websites are all applications. Update: This is for our company websites; it's not a shared hosting server, so we don't need to worry about separating them in /home/ or anything like that.

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• Submit form to another domain

  - by doubter

  I need to access the result of submitting a form to a website. There is a web site where you complete a form and it posts the information using ajax and then tells you if you have their service in the are or not. I'd like to be able to do this from my web page, which means posting the information required by the form to their server and getting the result. The problem is I get "403 Forbidden", I think it's because the "Origin" being a different domain. Is there anyway that I can the response from the server on my website? I thought about php_curl (used once with google docs api) but would like to know what you guys think it's the best way.

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• Mac OS X: easiest (free, non-QuickTime Pro) application for converting numbered folder of images to

  - by Jared Updike

  I'd like to convert a folder of PNGs into a quicktime .mov with PNG compression (it's a folder of fractals in an animation; PNG compression works great here and the losslessness is important). What programs will do this with minimal fuss? (I don't have or want to pay for a full license of QuickTime Pro.) UPDATE: Let me make this more clear: minimal fuss means: I download some EncoderMagic.app (for example), I double click it to launch it. I select the folder with my numbered images, and out pops my movie. No mess. No resizing. ... Perhaps this doesn't exist (or is called QuickTime Pro?)

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• Why would only the cpu fan not spin and no video displayed?

  - by Patrick

  I just built a new computer and when I first powered it on I got a continuous beeping which according to the manual means a power failure. After moving the voltage switch to the left a little I was able to get the beeping to stop. Even after the stopping though the CPU fan doesn't spin, and there is no display on the monitor. All the other fans and lights come on in the computer though, the DVD drive is working and ejects the tray, and the hard drive sounds like it spins up. Has anyone seen this before and know what is wrong or what has failed?

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• linux firefox flash debug: i don't get alerts when errors occur

  - by ufk

  Hello. I use firefox 3.6.13 on linux gentoo amd64 and flash 10.2 debug version, i also have firebug flashbug and flashfirebug installed. my problem is that whenever I run a flash application that encounters an error, the browser does not open an alert window. it makes it more difficult to debug applications because i need to make sure that the firebug window is always opened. the only way i can see the error is if i open the flash tab in firebug. is there a way to change this behavior ? i checked .xsession-errors and tried running firefox from console: these are the only errors the i see in the log and these errors do not appear when the flash app encounters an error which means they are not related: Gtk-Message: Failed to load module "canberra-gtk-module": libcanberra-gtk-module.so: cannot open shared object file: No such file or directory Gtk-Message: Failed to load module "gnomebreakpad": libgnomebreakpad.so: cannot open shared object file: No such file or directory thanks

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• Virtual PC network connection setting issue

  - by George2

  Hello everyone, I am using Virtual PC 2007 on Windows Vista Enterprise x86. My confusion is about the network setting for guest OS. In the network setting, I can set the network adaptor of guest OS to one of my physical network adaptors of my host OS (I have tested that it works for guest OS to use the physical network adaptor of host OS to access external network). But in this way, 1. since both host OS and guest OS will use the same physical network adaptor, will there be any conflicts (e.g. same H/W serves two OS)? 2. will guest OS share a part of network bandwidth of the host OS of the physical network adaptor? 3. What means NAT setting in guest OS network connection adaptor? thanks in advance, George

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• SQL Server 2000 msdb database loading/suspect

  - by Blake Parcell

  My SQL Server recently suffered a raid controller/hard drive crash. After getting my hard drive problem corrected I soon found that some of my databases were (suspect) namely msdb. I am not a DBA by any means however am somewhat familiar with the daily SQL activities that happen on my server. So I restored from backup, and tried to bring my msdb database online. It is now forever stuck in (Loading\Suspect) and I am unable to script backups for my important databases. I can recreate all of the backup plans etc if i can somehow get a working msdb. Any help would be greatly appreciated. I am currently using: Microsoft SQL Server 2000 Version: 8.00.194

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• kernel software trap handling

  - by Tony

  I'm reading a book on Windows Internals and there's something I don't understand: "The kernel handles software interrupts either as part of hardware interrupt handling or synchronously when a thread invokes kernel functions related to the software interrupt." So does this mean that software interrupts or exceptions will only be handled under these conditions: a. When the kernel is executing a function from said thread related to the software exception(trap) b. when it is already handling a hardware trap Is my understanding of this correct? The next bit: "In most cases, the kernel installs front-end trap handling functions that perform general trap handling tasks before and after transferring control to other functions that field the trap." I don't quite understand what it means by 'front-end trap handling functions' and 'field the trap'? Can anyone help me?

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• How to tell if PAE is hurting me?

  - by James

  I have a couple of servers with 20-30 GB RAM that are running (a variant of) RHEL4. They are currently running the SMP i386 kernel, not x64, not even the hugemem kernel. This means LowMem is confined to < 1G, and thus dentry_cache and ext3_inode_cache to 100M or so each. How can I tell if this is a problem? Here's a typical vmstat report while it's compiling some Java: $ vmstat 10 procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 1 0 19493816 394740 922420 0 0 1058 2292 1491 1020 6 3 80 12 2 1 0 19519480 395244 850156 0 0 1179 1412 1329 1195 9 4 75 12 1 1 0 19557368 392616 828344 0 0 1783 1680 1498 1756 14 5 72 9 I don't like the way bi is nonzero when there is so much memory free. I imagine slabtop could point more directly to the problem but I don't really understand how to interpret its output.

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• System shuts down immediately after few sconds

  - by Anil

  I have a computer with following specification and was working fine after re-installing the system and refitting sink fan unit. Recently it shuts down automatically after a few seconds. I checked PSU by shorting pin no.s 13 & 14 as well as 14 & 15. It worked well means the PSU fan moves. But I never checked the voltages at different wires. I refitted the heat sink fan by applying thermal paste. but it behaved the same. Again I refitted the Heat Sink Fan, then it worked for 2 minutes and again shut down. Now it shuts down immediately after switching on. Mother board : M26GTM-3VP CPU : AMD athlon PSU : 450 watt Can anyone help?

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