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• Sun Grid Engine: Automatically Terminating Idle Interactive Jobs

  - by dmcer

  We're considering using Sun Grid Engine on a small compute cluster. Right now, the current set up is pretty crude and just involves having people ssh to an open machine to run their jobs. We'd like to allow interactive jobs, since that should ease the transition from manually starting jobs to starting them using qsub. But, there is some concern that, if we do, people might accidentally leave their interactive sessions idle and block other jobs from being run on the machines. The issue isn't just theoretical, since we previously tried using OpenPBS and there was a problem with people opening up an interactive job in a screen session and essentially camping on a machine. Is there anyway to configure SGE to automatically kill idle interactive jobs? It looks like this was requested as an enhancement (Issue #:2447) way back in 2007. But, it doesn't seem like the request ever got implemented.

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• Locking down a box on the web

  - by glowcoder

  I'm a Java developer who is looking to put a game on the web. I'm not much of a web or server guy, though, and frankly I seem a little lost at where I should start with putting something on the web. My application works fine on my machine, and I'm sure I can make it work fine on any box I put it on. But the security of that box is pretty important. If I sign up for a standard hosting package (let's say from GoDaddy or something) can I simply tell them "make port 12345 open for communication" and let them handle the rest of the security details? If I can't, what are the things I'm going to need to know to prevent my game server from getting hacked to shreds? (Links to solid resources fine by me!) Thanks!

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• How to black out second monitor when playing a full screen game?

  - by Gary

  I've got two monitors. When I play a full screen game in my primary monitor, the second monitor still shows the Windows desktop. How can I black out the second monitor so that it doesn't show anything at all? My graphics card is from ATI. I'm running Windows 7 in Boot Camp on an iMac. I don't know if this makes a difference, however, as any solution to my question will do, really. For instance, is there a tiny app that I could run to disable the second monitor for a while? I'd rather not have to open Windows display settings every time I run a game and disable the monitor that way, though.

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• git init --bare permission denied on 16gb USB stick

  - by Sour Lemon

  I am using GIT on a Windows 7 machine (64 bit) and have been learning how to use GIT to version control my files. Now I want to be able to create a --bare repository on an external device (in this case a 16gb USB stick) but unfortunately when I try to create a --bare repository on it I get the following error: f:/: Permission denied I am using the GIT Bash program which is installed with GIT on Windows machines, so these are the commands I am typing in (I am also opening the program as administrator by holding ctrl + shift when I open it) cd /f git init --bare f:/: Permission denied However if I create a normal repository it works just fine: cd /f git init Initialized empty repository in f:/.git/ Can anybody shed some light on why I can't create a --bare repository? Any help would be much appreciated.

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• While in CMD shell, copying files from host OS to guest VM locks files (VMware Player/Workstation)

  - by Malcolm

  We're running the latest versions of VMWare Player and Workstation for Windows. The following behavior is identical across both products. Problem: We open a CMD prompt in our guest OS (XP, Vista, Windows 7) and copy files from our host OS using the standard CMD shell copy command: copy z:\C$\testfiles The copy completes successfully, but from that point forward, all the files that were copied to our guest OS are now LOCKED on our host OS. This does not happen if we use Windows Explorer to copy files - it only happens when files are copied via the CMD shell. As mentioned at the start of this question, this behavior is reproducible in both VMWare Player and VMWare Workstation across multiple machines and multiple guest OS's. I've googled for a workaround, but without success. Any ideas appreciated. Malcolm

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• PFSense CSR Generation

  - by ErnieTheGeek

  I'm trying to figure out how to generate a CSR so I can generate and install a SSL cert. Here's a LINK to what I've what tried. Granted that post was for m0n0wall, but I figured openssl is openssl. Heres where I get stuck. When I run this: /usr/bin/openssl req -new -key mykey.key -out mycsr.csr -config /usr/local/ssl/openssl.cnf I get this: error on line -1 of /usr/local/ssl/openssl.cnf 54934:error:02001002:system library:fopen:No such file or directory:/usr/src/secure/lib/libcrypto/../../../crypto/openssl /crypto/bio/bss_file.c:122:fopen('/usr/local/ssl/openssl.cnf','rb') 54934:error:2006D080:BIO routines:BIO_new_file:no such file:/usr/src/secure/lib/libcrypto/../../../crypto/openssl/crypto/ bio/bss_file.c:125: 54934:error:0E078072:configuration file routines:DEF_LOAD:no such file:/usr/src/secure/lib/libcrypto/../../../crypto/open ssl/crypto/conf/conf_def.c:197:

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• Linux: close a program with command line (not kill it)

  - by CodeNoob

  Some applications only allow one running instance (like eclipse, if you want to use the same workspace). So if I log in from another location, I have to kill/close the application that was open when I previously logged in from another location. I always use kill command to kill the running process. But, if you kill a process, it might not save some states that are useful for future usage. However, if you "close" it properly byclicking on the close button, for example, it will save the states properly. Is there a way to properly "close" an application from command line? I know this can vary from applications, so let's be a bit more generic: how to send a signal to another running application, and this signal works just as if we click the "close" button in the top bar? thanks!

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• How to shorten DNS propagation effect

  - by Sempa

  Atm i have a domain example.com, it uses dedicated server, and it uses "ns1.example.com" and "ns2.example.com" as nameserver. Now i want to change to another dedicated server (with different IP obviously). How to shorten DNS propagation effect so that all visitors that open my domain will be pointed to the new server quickly? At this moment i am lowering the TTL value on old server (to 5 minutes) hoping that once i change the nameserver, all visitors will be pointed to new server. Am i correct? If not, can you give me suggestion?

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• qemu command not running directly

  - by Dr. Death

  Can I use "qemu://localhost/system " command directly inplace of "virsh -c qemu://localhost/system " command if my both machines are physically connected in a network as virsh will simply creating the virtual shell between two systems? can I use ssh in place of virtual shell here? I tried this but system gives no directory or file name for qemu even when i had qemu installed properly in my system. but when i use virsh i did not get such errors. Do i need to open any unix socket for doing this?

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• Low-cost, Flexible Log Aggregation [closed]

  - by Dan McClain

  I'm starting to have quite the collection of Ubuntu VMs that I must manage. I'm starting to investigate Puppet for managing the configuration of all of them, and apticron to let me know what's out of date. But the issue I feel I should deal with sooner than later is log aggregation. I'd like to stay in the free/open source realm for now, seeing that we don't have much budget for something like splunk yet. In addition to syslog, I would like to collect application specific logs (We are running different apps on different machines, from nginx+passenger for rails, to Apache+Tomcat for java, to PHP for expression engine, and mysql/postgresql database server), so that we can analyze the relavent data. For now, I'm just looking to get all the logs one place.

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• sftp to cygwin cmd fails with "received message too long"

  - by ana

  I have a windows server running cygwin, where open-ssh is set up. I am able to ssh into the server fine. I need to run a script that I cannot amend, and which needs to copy files via sftp, and requires the shell to be cmd. However, it fails with the message "received message too long" because when cmd starts it displays the Windows banner, and sftp chokes on this. I can't find any way to disable the banner, or redirect the output, or in any way get around this problem. Does anyone know how I can fix this?

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• IE8 Crash On Startup

  - by Wonko the Sane

  Hello All, I have a problem - IE8 has suddenly stopped working. I was doing some development work, and suddenly IE8 crashed every time I tried to use it. I've rebooted, but still crash every time I try to open it. There is no real indication as to what has gone wrong. It just says "Internet Explorer has stopped working". I've tried almost everything that I've seen when I've Googled it: I disabled all Add-Ins via Manage Add-Ins, but it still crashes on startup* I re-registered IEPROXY.DLL * The thing I don't understand is that if I start from the Run box with the -extoff option, IE starts up. Isn't that the same as disabling all Add-Ins? Any ideas? Thanks, wTs

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• Port forwarding no longer works

  - by Auryn

  Prior to testing an OpenVPN installation, I setup a basic VPN server using the software already built into Windows 7. Port forwarding on the Linksys router worked as normal and I was able to connect remotely. After doing an install of OpenVPN Access Server on a spare box running Ubuntu, and adding new ports to be forwarded I was unable to access the VPN from an external source as the required ports all indicated that they were closed. (During testing XRDP and VNCSERVER were also installed to facilitate access to the box) Checking back on the Windows 7 VPN resulted in no access to that vpn setup either. All ports are now reporting a being closed despite being previously open even ports that were being used for other services. Adding and removing port forwarding rules seem to have no effect. At this point, in order to troubleshoot, both the firewall and anti-virus software have been disabled on the Windows 7 machine. Could this be just a router issue? Is there any way out of this without having to reset and reconfigure the router?

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• Make Apache to listen in multiple IPs

  - by Enrique Becerra

  Hi I'm in a big LAN, which is behind a proxy/firewall I'm working with an apache/php/mysql application, which is hosted in a small server besides my workstation. This server is connected to the LAN also and is behind the proxy: The server has a local IP assigned: 10.64.x.x Also, this server has a public IP assigned (or redirected from within the proxy/firewall) which is: 200.41.x.x I can't access public IP from LAN, but I can ping to the public IP from outside the building How should I configure Apache to listen also for public IP and open the 80 port for people accessing from outside the building?. It is set now to Listen 10.64.x.x:80 Thanks a lot in advance,

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• CentOS running inside VMware as WebServer times out on outside connection

  - by Tom Hart

  I have a CentOS machine running inside VMware, and I have got PHP and Apache set up on it, so if I open a browser (on the VM) and go to either localhost, or 192.168.0.3, I get a phpinfo page I made in /var/www/html/index.php, but, if on the host (Windows 7), in my browser I go to 192.168.0.3, it times out. I can ping the IP address from Windows and get a response, I just can't through the browser. Does anyone have any ideas what I need to do to get this working? This is my first time using a VM and I'm getting lost in the network settings.

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• Why can't I change the domain when connecting to network shares in Windows 8?

  - by Nathan Osman

  I have a computer running Windows 8.1 Pro. I also have Ubuntu 12.04.3 Server running within Hyper-V on the same machine. The Ubuntu server has Samba installed. Both the host and guest OS are connected to the workgroup WORKGROUP. When I open up "Network" in Windows 8.1 and attempt to connect to the server (both by name and IP address), I receive the following prompt: Entering the correct username and password for an account on the server fails. /etc/samba/smb.conf has the following share definitions set: [homes] comment = Home Directories browseable = no

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• Automatically save/download e-mail body to disk

  - by CatamountJack

  Is there a program that will allow me to connect to my mail server (IMAP) and automatically save certain new e-mails to disk? Multiple times a day I receive automated e-mail updates about pending jobs from a system that processes some information for us. The data in these e-mails is written as plain-text within the body of the message. I would like to download the newest message, parse it, and display it on my desktop. The last two parts I can manage ok - it's just the automatic downloading that is posing a challenge. I don't use Outlook (I do use Thunderbird), but would prefer not to have the client open to make this happen. I'm currently running Win7.

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• gentoo install error

  - by alleria

  i installed gentoo by the handbook from official site , when i got into the step 7.b. Installing the Sources , the book says :Code Listing 2.2: Viewing the kernel source symlink, When you take a look in /usr/src you should see a symlink called linux pointing to your kernel source. but ,in my virtualbox, there is no such file! ,only a linux-3..3.38-gentoo directory in the src and when i tried to use cd linux-3.3.38-gentoo and make menuconfig , an error occured , init/Kconfig:389: can't open file "kernel/irq/Kconfig" how can i solve the problem?

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• How do I access a shared folder using credentials other than the ones I logged in with?

  - by George Sealy

  I have a lab full of Windows 7 machines, and a shared login (user360) that all my students use. I also have a shared folder that they can all have read/write access to (for moving files around easily). My problem is that I also want to be able to create a shared folder for each student for submitting assignments. I can set up a shared folder with permissions for just a single user, and not the 'user360' account. The problem is, when I'm logged in as user360, and I try to open the 'StudentA', Windows never asks me for alternate credentials, it just refuses access because the user360 account is not allowed access. Can anyone suggest a fix for this?

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• Mac OS X: network disabled because security breach

  - by fireeyedboy

  Dear all, I just recieved a message on my Mac OS X system telling me (loosely translated from Dutch): "The network has been temporarily disabled because the network's security was breached." (It's a wireless WPA2-PSK secured network BTW) I looked in the logs of my router (a Zyxel P-2602HW-D1A) only to see a few (outbound) "syn flood TCP ATTACK" logs, but those were from like a week ago, other than that nothing. What tools on Mac OS X do I have to analyse this security breach occurence? Are there some security logs on Mac OS X that I can inspect? What other measurements should I take? And how serious should I take this warning from Mac OS X? System: Macbook Pro Intel Core 2 Duo 2.2 Ghz OS: Mac OS X 10.5.8 Network: wireless WPA2-PSK Relevant software: Parallels Desktop with Windows XP (was open, but stopped at the time) Other systems on my network: Windows XP SP3 desktop (was running at the time) If you need any more info, don't hestitate to ask. Thanks in advance.

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• Virus disturbing my audio

  - by Mike M

  i had a desktop.ini virus on my computer. I managed to get rid of it (i think) but now my Mcafee firewall will not stay on for more than 3 secs before it turns off again. Also something is freezing my computer for a few secs when a window is open, also my audio goes in and out when watching videos and listening to music. I figured out that it only happens when i connect to the internet. I have to restart my PC and quickly disconnect the internet if i want to listen to music. also i have vista

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• Windows Media Center doesn't see my movies

  - by DrJekyll

  I am trying to configure my Windows Media Center (Windows 7 Ultimate). I selected folder with my movies and added it to the library, but when I went to the movies library, it says "There are no items in this library yet - Windows Media Center is searching for media files in the background...". I have all necessary codecs installed, Windows Media Player opens those movies correctly. When I right click on the file - Open with - Windows Media Center it also plays them without any problem. Any ideas why they don't appear in the libraries?

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• Apache + mod_php Ignores SUID?

  - by profitphp

  Does apache or mod_php cause a SUID flag to be ignored when using the shell_exec command from a web accessed PHP script? I'm trying to allow a web accessible PHP script to rename some files which the apache user does not have write access to. I don't want to give it access to write these, as I only want one controlled script to be able to do this. I'm trying to avoid SUDO and the config needed or the headache/insecurity of using a que called from a privileged users cron, and it seemed like I should be able to use SUID to accomplish this. If you need more info, I've got a similar question open over here, but I think its too detailed and people are not seeing what I'm asking. http://stackoverflow.com/questions/6432931/suid-issues-with-php-apache

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• Trying to mount NFS share on Windows Machien at startup with Z: letter for all users

  - by ScottC

  Windows Server 2008 We are trying to mount a specific drive letter on a windows machine from a unix machine. We need the mount to be available to the server even if no users are logged in and to users who are logged in with If we run the command from the command prompt manually it conencts and we have access to the NFS share, and can open it and see and edit files. mount -o fileaccess=777 anon \\127.0.0.1\nav z: (ip address replaced with 127.0.0.1 for security reasons) However if we try to automate the task by making an entry in the task schedule for boot time, to execute the batch script, it adds a disconencted drive to the list in 'My Computer' but it is disconencted and when trying to access the drive an error is produced: Z: is not accessible The data area passed to a system call is too small.| Tried as administrator with highest privelidges, as SYSTEM (group) and as my user (adminstator level user) same results. Is there another way to do this? Most of the help I have found online suggest this way but it keeps failing.

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• Fighting Spam - What can I do as an: Email Administrator, Domain Owner, or User?

  - by Chris S

  This is a Canonical Question about Fighting Spam. Also related: How to stop people from using my domain to send spam? There are so many techniques and so much to know about fighting SPAM. What widely used techniques and technologies are available to Administrator, Domain Owners, and End Users to help keep the junk out of our inboxes? We're looking for an answer that covers different tech from various angles. The accepted answer should include a variety of technologies (eg SPF/SenderID, DomainKeys/DKIM, Graylisting, DNS RBLs, Reputation Services, Filtering Software [SpamAssassin, etc]); best practices (eg mail on Port 25 should never be allowed to relay, Port 587 should be used; etc), terminology (eg, Open Relay, Backscatter, MSA/MTA/MUA, Spam/Ham), and possibly other techniques.

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