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• Motherboard Issue - 3 Beep Bios (memory error) despite new RAM

  - by Glenn

  I have an Intel dG43RK motherboard, bought new and sealed, and have tried two different brands and speeds of RAM with a 3-beep BIOS indicating a memory error, which also occurs without RAM installed (as it should). The memory tried is; 1x4GB 1333 Kingston HyperX DDR3 RAM (New and Sealed) 2x4GB Team Elite 1066 DDR3 RAM (New and Sealed) I have tried multiple configurations and seating layouts and still no luck. I also have a GT520 graphics card on board as I dislike in-built graphics in most cases and had it at hand (also new and sealed). The only used parts are the CPU, which worked in my previous tower and was directly taken from the PC into the new set-up and the CPU Fan which will be replaced with a new fan in the foreseeable future once this is resolved. I've run out of ideas myself and any help is appreciated.

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• NFS compound failed for server foosrv: error 7 (RPC: Authentication error)

  - by automatthias

  I'm setting up an Ubuntu NFS server with a Solaris 10 client. The basic configuration looks okay to me, and it was also working for some time. I'm getting an "RPC: Authentication error" message on the client. server /etc/exports: /export/opencsw-future 192.168.3.0/24(rw,nohide,insecure,no_subtree_check,async) /export/opencsw-current 192.168.3.0/24(rw,nohide,insecure,no_subtree_check,async) $ ls -ld /export/opencsw-current drwxr-xr-x 7 maciej maciej 4096 2012-02-05 14:55 /export/opencsw-current client $ grep opencsw /etc/vfstab foosrv:/opencsw-current - /export/opencsw-current nfs - yes - $ sudo mount /export/opencsw-current NFS compound failed for server foosrv: error 7 (RPC: Authentication error) (...repeated...) nfs mount: mount: /export/opencsw-current: Permission denied My server host name resolves to both IPv4 and IPv6 addresses.

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• Trailing comments after variable assignment subvert comparison

  - by nobar

  In GNU make, trailing comments appended to variable assignments prevent subsequent comparison (via ifeq) from working correctly. Here's the Makefile... A = a B = b ## trailing comment C = c RESULT := ifeq "$(A)" "a" RESULT += a endif ifeq "$(B)" "b" RESULT += b endif ifeq "$(C)" "c" RESULT += c endif rule: @echo RESULT=\"$(RESULT)\" @echo A=\"$(A)\" @echo B=\"$(B)\" @echo C=\"$(C)\" Here's the output... $ make RESULT=" a c" A="a" B="b " C="c" As you can see from the displayed value of RESULT, the ifeq was affected by the presence of the comment in the assignment of B. Echoing the variable B, shows that the problem is not the comment, but the intervening space. The obvious solution is to explicitly strip the whitespace prior to comparison like so... ifeq "$(strip $(B))" "b" RESULT += b endif However this seems error prone. Since the strip operation is not needed unless/until a comment is used, you can leave out the strip and everything will initially work just fine -- so chances are you won't always remember to add the strip. Later, if someone adds a comment when setting the variable, the Makefile no longer works as expected. Note: There is a closely related issue, as demonstrated in this question, that trailing whitespace can break string compares even if there is no comment. Question: Is there a more fool-proof way to deal with this issue?

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• Xen find VBD id for physical disks

  - by Joe

  I'm starting a xen domU using xm create config.cfg. Within the config file are a number of physical block devices (LVs) which are added to the guest and can be accessed fine when it boots. However, at a point in the future I need to be able to hot unplug one of these disks using the xm block-detach command. This command, however, requires the vbd id of the device to be detached and I can't find a way to find the device id for a particular disk 'plugged in' at start up. Any help is much appreciated!

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• strategy /insights for avoiding document content loss due to encryption

  - by pbernatchez

  I'm about to encourage a group of people to begin using S-Mime and GPG for digital signatures and encryption. I foresee a nightmare of encrypted documents which can no longer be recovered because of lost keys. The thorniest issue is archiving. The natural way to preserve privacy in an archive is to archive the encrypted document. But that opens us up to the risk of a lost key when time comes to unarchive a document, or a forgotten password. After all it will be a long way in the future. This would be equivalent to having destroyed the document. First thought is archiving keys with documents, but that still leaves the forgotten pass phrase. Archiving the passphrase too would be tantamount to archiving in the clear. No privacy. What approaches do you use? What insights can you offer on the issue?

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• Using command line to connect to a wireless network with an http login

  - by Shane

  I'm trying to connect to a wifi network where it hijacks all requests and redirects you to a page where you have to agree to a terms of use before it lets you connect to the actual outside world. This is a pretty common practice, and usually doesn't pose much of a problem. However, I've got a computer running Ubuntu 9.10 server with no windowing system. How can I use the command line to agree to the terms of use? I don't have internet access on the computer to download packages via apt-get or anything like that. Sure, I can think of any number of workarounds, but I suspect there's an easy way to use wget or curl or something. Basically, I need a command line solution for sending an HTTP POST request essentially clicking on a button. For future reference, it'd be helpful to know how to send a POST request with, say, a username and password if I ever find myself in that situation in another hotel or airport.

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• Soft links between samba profile and profile.V2

  - by Alex Rose

  I am currently using a samba server to host windows sessions. For the moment, every machine runs windows XP, but in an upcoming hardware upgrade, I will have new Windows 7 machines installed. The problem is that the user directory changed from XP to 7 (for instance 'My Documents' became 'Documents'). To solve that, samba created a folder called profile.V2, which contains files and folders for Windows 7. Now I would like to link the two profiles folders ('profile' from windows XP, 'profile.V2' from windows 7) so that a user can logon from a XP or 7 machine and still have access to the same files. I tried to create softlinks between folder pairs ('Documents' -­­ 'My documents') and it seems to work. My question is : is it likely to create issues in the future?

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• Why does this Java code not utilize all CPU cores?

  - by ReneS

  The attached simple Java code should load all available cpu core when starting it with the right parameters. So for instance, you start it with java VMTest 8 int 0 and it will start 8 threads that do nothing else than looping and adding 2 to an integer. Something that runs in registers and not even allocates new memory. The problem we are facing now is, that we do not get a 24 core machine loaded (AMD 2 sockets with 12 cores each), when running this simple program (with 24 threads of course). Similar things happen with 2 programs each 12 threads or smaller machines. So our suspicion is that the JVM (Sun JDK 6u20 on Linux x64) does not scale well. Did anyone see similar things or has the ability to run it and report whether or not it runs well on his/her machine (= 8 cores only please)? Ideas? I tried that on Amazon EC2 with 8 cores too, but the virtual machine seems to run different from a real box, so the loading behaves totally strange. package com.test; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.Future; import java.util.concurrent.TimeUnit; public class VMTest { public class IntTask implements Runnable { @Override public void run() { int i = 0; while (true) { i = i + 2; } } } public class StringTask implements Runnable { @Override public void run() { int i = 0; String s; while (true) { i++; s = "s" + Integer.valueOf(i); } } } public class ArrayTask implements Runnable { private final int size; public ArrayTask(int size) { this.size = size; } @Override public void run() { int i = 0; String[] s; while (true) { i++; s = new String[size]; } } } public void doIt(String[] args) throws InterruptedException { final String command = args[1].trim(); ExecutorService executor = Executors.newFixedThreadPool(Integer.valueOf(args[0])); for (int i = 0; i < Integer.valueOf(args[0]); i++) { Runnable runnable = null; if (command.equalsIgnoreCase("int")) { runnable = new IntTask(); } else if (command.equalsIgnoreCase("string")) { runnable = new StringTask(); } Future<?> submit = executor.submit(runnable); } executor.awaitTermination(1, TimeUnit.HOURS); } public static void main(String[] args) throws InterruptedException { if (args.length < 3) { System.err.println("Usage: VMTest threadCount taskDef size"); System.err.println("threadCount: Number 1..n"); System.err.println("taskDef: int string array"); System.err.println("size: size of memory allocation for array, "); System.exit(-1); } new VMTest().doIt(args); } }

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• How to obtain printed page count if no web-gui or driver-gui is available to show it

  - by Macgreggor at your service

  I am curious if windows print servers can keep a count of the printed pages sent to it? Can an individual PC (WinXP+)? Is there some secret command you can send it (with telnet, dos, etc)? I searched & couldn't find any questions similar to this here so lets keep this open-ended for future people who are curious. Is this more suited towards server fault? Maybe, but this is more about printers & local PC's have print servers now-a-days. Anyhow in my situation I have the following printers (yes old) I am curious on page-counts: HP Laserjet 1300 (using some kind of PC-card to LPT/Parallel adapter, then a network adapter on top of that [Netgear PS101 print server]) Canon Faxphone L80 Epson LX-300+

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• Creating a seperate static content site for IIS7 and MVC

  - by JK01

  With reference to this serverfault blog post: A Few Speed Improvements where it talks about how static content for stackexchange is served from a separate cookieless domain... How would someone go about doing this on IIS7.5 for a ASP.NET MVC site? The plan so far: Register domain eg static.com, create a new website in IIS Manually copy the js / css / images folders from MVC as is so that they have the same paths on the new server Enable IIS gzip settings (js/css = high compression, images = none) Set caching with far future expiry dates <clientCache cacheControlCustom="public" /> in the web.config Never set any cookies on the static.com site Combine and minimize js / css Auto deploy changes in static content with WebDeploy Is this plan correct? And how can you use WebDeploy to deploy the whole web app to one server and then only the static items to another? I can see there is a similar question, but for apache: Creating a cookie-free domain to serve static content so it doesn't apply

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• Data loss with roaming profiles on login on two different computers

  - by Jurriaan Pijpers

  We have a Windows server 2003 system with Active Directory and all of our users have roaming profiles. One of the users let someone login with his username and password on a different computer (2) while he was working on his own computer (1). Now when this user logs in on his own computer (1), the profile that is loaded is one that dates back many months (i think from the last time he logged on to computer 2). My suspicion is that the profile that was cached on computer 2 from many months back when this user last logged on on this computer, on logoff, synced over the newer profile on the server. so that now when he logs in, he gets this old profile. Now my questions: Is it possible to retrieve te newer profile? Is it possible to keep this from happening in the future?

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• How do I mount a sparse disk image permanently?

  - by Mike

  On Mac OS X 10.6.7, when I mount a sparse disk image (either by double-clicking it or using hdid from the command line), the image: Appears on my desktop Needs to be re-mounted every time I log in I'd like to set up the equivalent of an /etc/fstab which will mount the image when the system boots, and make it permanent - so I don't have to worry if my symbolic links will resolve or not. Is this more trouble than it's worth on a Mac? I noticed that there is no /etc/fstab, and /etc/fstab.hd contains a dire warning: IGNORE THIS FILE. This file does nothing, contains no useful data, and might go away in future releases. Do not depend on this file or its contents. I tried sudo hdid -notremovable <image>, which seemed like half of what I wanted (according to man hdid), but it failed with an error: hdid: attach failed - no mountable file systems.

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• Network Monitoring Tool Recommendation

  - by user42801

  Hello, My company is looking for a monitoring app/tool that would allow us to capture and graph statistics on network performance. As a starting point, we would like to ping remote host(s) and gateway(s) from several of our servers, grab an average of the ping times from each of our servers to the remote host(s), and then graph it (preferably in a central location). Also, we would like to be able to graph the results for time frames as short as a week to as long as 6 months. It is reasonable to expect that we would ask more of the selected monitoring app/tool as we come up with other key network performance indicators in the future. So an app with great flexibility and features would be ideal. Upon first glance, Cacti looks like it might be a fit. Any other recommendations? Thanks in advance for any input.

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• How to backup mirror copies of C: drive?

  - by metal gear solid

  I've installed everything on my C: Drive . Whatever i need Windows 7, updated drivers and utilities and software etc i need. I now i want to take a backup mirror of everything in a DVD or i can keep backup in another USB HDD. so in case if i face any windows or hard-drive failure in future then i can restore everything as it is as all are today. I don't want to reinstall everything again Windows, Drivers all utilities and all needed soft-wares. My C: Drive's total capacity is 108 GB but data on c: drive is only 12 GB. What Should i do ? What is the best solution for me? I need free solution.

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• How do you prove a function works?

  - by glenn I.

  I've recently gotten the testing religion and have started primarily with unit testing. I code unit tests which illustrate that a function works under certain cases, specifically using the exact inputs I'm using. I may do a number of unit tests to exercise the function. Still, I haven't actually proved anything other than the function does what I expect it to do under the scenarios I've tested. There may be other inputs and scenarios I haven't thought of and thinking of edge cases is expensive, particularly on the margins. This is all not very satisfying to do me. When I start to think of having to come up with tests to satisfy branch and path coverage and then integration testing, the prospective permutations can become a little maddening. So, my question is, how can one prove (in the same vein of proving a theorem in mathematics) that a function works (and, in a perfect world, compose these 'proofs' into a proof that a system works)? Is there a certain area of testing that covers an approach where you seek to prove a system works by proving that all of its functions work? Does anybody outside of academia bother with an approach like this? Are there tools and techniques to help? I realize that my use of the word 'work' is not precise. I guess I mean that a function works when it does what some spec (written or implied) states that it should do and does nothing other than that. Note, I'm not a mathematician, just a programmer.

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• Is it possible to spoof or reuse VIEWSTATE or detect if it is protected from modification?

  - by Peter Jaric

  Question ASP and ASP.NET web applications use a value called VIEWSTATE in forms. From what I understand, this is used to persist some kind of state on the client between requests to the web server. I have never worked with ASP or ASP.NET and need some help with two questions (and some sub-questions): 1) Is it possible to programmatically spoof/construct a VIEWSTATE for a form? Clarification: can a program look at a form and from that construct the contents of the base64-encoded VIEWSTATE value? 1 a) Or can it always just be left out? 1 b) Can an old VIEWSTATE for a particular form be reused in a later invocation of the same form, or would it just be luck if that worked? 2) I gather from http://msdn.microsoft.com/en-us/library/ms972976.aspx#viewstate_topic12 that it is possible to turn on security so that the VIEWSTATE becomes secure from spoofing. Is it possible for a program to detect that a VIEWSTATE is safeguarded in such a way? 2 a) Is there a one-to-one mapping between the occurrence of EVENTVALIDATION values and secure VIEWSTATEs? Regarding 1) and 2), if yes, can I have a hint about how I would do that? For 2) I am thinking I could base64-decode the value and search for a string that always is found in unencrypted VIEWSTATEs. "First:"? Something else? Background I have made a small tool for detecting and exploiting so called CSRF vulnerabilities. I use it to quickly make proof of concepts of such vulnerabilities that I send to the affected site owners. Quite often I encounter these forms with a VIEWSTATE, and these I don't know if they are secure or not. Edit 1: Clarified question 1 somewhat. Edit 2: Added text in italics.

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• What is the lightest, basic Email Server for Linux?

  - by Xeoncross

  I would like to install an extremely small mail server on my VPS and I am only interested in it sending out mail (activation links) from my web site. I don't need it to support mailboxes or incoming mail (although having that option for the future might be nice). The main requirement is that I don't have to worry about monitoring it as often and protecting against people bouncing messages off my server or wasting resources with incoming mail. I just want to send mail out. So something small that only listens on localhost would be ideal. The other requirement is that it is documented so I can learn how to set it up and manage it.

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• How can I remap control+e to escape+control+e in iTerm2?

  - by cwd

  I have set up a few custom keyboard shortcuts in iTerm2 to easily move the cursor around with the arrow keys, but now I'd like to remap control+e to be escape, control+e because bash 4.2 no longer auto-expands variables using the tab key. I know I've done the first part correctly in choosing the keyboard shortcut to remap, but I don't understand how to look up the correct escape sequence (or hex codes) to send in the bottom section: I reference they keyboard codes but that wasn't much help. How can I remap this, and how can I look up the codes in the future? (No luck with Google) Update @db - thanks. To save others trouble I also found a cool util Key Codes.app which can be used to find key codes:

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• Less daunting front end for SQL Server

  - by Martin

  We currently have a few users who have been using Access very succesfully to throw around large amounts of data. We've now got to the point where the data is just too large to be held in Access, as well as wanting to hold it in a single place where multiple users can access it. We have therefore moved the data over to SQL Server. I want to provide a general tool that they can use to view the data on the server and do some simple things like run queries and filters and export the data for offline manipulation. I don't want the support headaches that might come with rolling out SQL Management Studio, and neither do I want to have to create an Access database with links for each current database or ones that are created in the future. Can anyone recommend a simple tool that will connect to a server, list all the databases and allow a user to drill into a table and look at the data. Many thanks.

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• Best practice for managing changes to 3rd party open source libraries?

  - by Jeff Knecht

  On a recent project, I had to modify an open source library to address a functional deficiency. I followed the SVN best practice of creating a "vendor source" repository and made my changes there. I also submitted the patch to the mailing list of that project. Unfortunately, the project only has a couple of maintainers and they are very slow to commit updates. At some point, I expect the library to be updated, and I expect that my project will want to use the upgraded library. But now I have a potential problem... I don't know whether my patch will have been applied to this future release of the 3rd party library. I also don't know whether my patch will even still be compatible with the internal implementation of the upgraded components. And in all likelihood, someone else will be maintaining my project by that point. Should I name the library in a special way so it is clear that we made special modifications (eg. commons-lang-2.x-for-my-project.jar)? Should I just document the patch and reference the SVN location and a link to the mailing list item in a README? No option that I can think of seems to be fool-proof in an upgrade scenario. What is the best practice for this?

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• How do I run multiple commands on one line in Powershell?

  - by David

  In cmd prompt, you can run two commands on one line like so: ipconfig /release & ipconfig /renew When I run this command in PowerShell, I get: Ampersand not allowed. The & operator is reserved for future use Does PowerShell have an operator that allows me to quickly produce the equivalent of & in cmd prompt? Any method of running two commands in one line will do. I know that I can make a script, but I'm looking for something a little more off the cuff.

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• How can I get a notification from my server if the mail queue stops

  - by Ash

  I am using QMail with Plesk 10 on an Apache server. Occasionally the mail queue stops processing emails - this most recently happenend when an email account got hacked and started sending hundreds of emails. We did not find out about this until a client of ours contacted to say that their emails were not being recieved, so we checked the mail queue and lo and behold the service had stopped. In future I would like to be notified when the mailqueue stops. How can I set something up so the server will run a command whenever the mailqueue stops?

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• Building Active Record Conditions in an array - private method 'scan' called error

  - by Nick

  Hi, I'm attempting to build a set of conditions dynamically using an array as suggested in the first answer here: http://stackoverflow.com/questions/1658990/one-or-more-params-in-model-find-conditions-with-ruby-on-rails. However I seem to be doing something incorrectly and I'm not sure if what I'm trying is fundamentally unsound or if I'm simply botching my syntax. I'm simplifying down to a single condition here to try to illustrate the issue as I've tried to built a simple Proof of concept along these lines before layering on the 5 different condition styles I'm contending with. This works: excluded.push 12 excluded.push 30 @allsites = Site.all(:conditions => ["id not in (?)", excluded]) This results in a private method 'scan' called error: excluded.push 12 excluded.push 30 conditionsSet << ["id not in (?)", excluded] @allsites = Site.all(:conditions => conditionsSet) Thanks for any advice. I wasn't sure if the proper thing was to put this as a followup item to the related question/answers I noted at the top. Since I've got a problem not an answer. If there is a better way to post this related to the existing post please let me know.

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• Laptop Toshiba Satelite M300 screen is completely blank.

  - by Nadia

  Hi, My laptop Toshiba satelite M300 Laptop screen is completely blacked out. It powers up and appears to be running but the screen is blank. I've taken battery pack off and back on again. Before the screen was blacked out, it used to flicker a bit. Also before it blacked out i was having problems with the internet and I was on phone to Internet provider who took me through steps to take my laptop back to a future date where it was operational. It then worked properly for a few days but then switched it on and screen was blank. It's more then a year old so out of warranty. Any suggestions on whether I should pay the $300 bucks to see if they can fix it?

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• SQL Server 2005/2008 Licensing Decision

  - by Hakim

  Hello, I have purchased a dedicated server from a reputable Hosting company. They only have Windows Server 2008 OS installed on it and NO Sql server. Server Configuration is Intel Dual core Processor with 2GB of RAM and 100GB HDD. I wanted to host my web services on that server which will be using the MS SQL Server 2005 at the backend.There are multiple web services and each using a different Database. Microsoft has CAL basis Licensing , Which I understand is based on number of users accessing the database directly ( I may be wrong ) . But my users will be accessing the webservice and no direct connection to the database as such. Yes but the number of users accessing the web server cannot be known and is not under my control. Which Licensing is best suited for this kind of setup ? I don't need analysing and BI services right now ,but i may want to upgrade that in future may be. Any help will be appreciated. Thanks

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