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• Increasing file descriptor limit on Debian does not work! Help!

  - by Aco

  I am running Debian 6 and I am trying to increase the file descriptor limit but it does not want to work. This is what I have done: I edited /etc/sysctl.conf by adding fs.file-max = 64000 at the end and applied the changes using sysctl -p. I then edited /etc/security/limits.conf and added the following lines: * soft nofile 64000 and * hard nofile 64000. Now when I execute ulimit -Hn and ulimit -Sn I still see 1024. I rebooted the server and I still get the same result. What have I failed to do?

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• What could prevent one Amazon EC2 instance from pinging another instance's Private IP?

  - by ks78

  I have multiple Amazon EC2 instances which need to communicate using private IPs. However, so far I've been unable to ping one instance's private IP from another instance. I can ping external addresses, such as their Elastic IPs and other sites (yahoo, google, etc), so it seems there's nothing wrong with the instances' network configuration. Also, they are all in the same zone, so that shouldn't be an issue. Does anyone have any idea what I could be doing wrong? Could this related to the Security Group settings?

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• How to prevent Ubuntu from combining networks on 2 NIC server?

  - by SolarPower

  I've got a Ubuntu Server 10.10 with 2 network interfaces with a cable plugged into both going to switches on completely different networks with different routers. One network is the 10.1.10.X network with a separate gateway/router - the server has an IP of 10.1.10.50 with the gateway IP of 10.1.10.1. The other interface is 10.2.10.X, IP 10.2.10.50, gateway 10.2.10.1. All my Mac machines are on the 10.2.10.X network, and all servers on the 10.1.10.X. The ONLY connection between the two is this machine. From a Mac in my office, I CANNOT ping any computer on the 10.1.10.X network except the Ubuntu machine I'm talking about. However, under the Shared column in Finder, I can see every server on the other network listed. That makes me believe that somehow this Ubuntu machine is letting certain requests span both networks, which is a security problem. Hope this is enough info.

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• Sql 2008 r2 DEV install failed

  - by obulay

  I am trying to install Sql 2008 r2 DEVeloper on Windows 2008 STD. It previously had Sql 2008 Enterprise installed. I first uninstalled SQL 2008. I think uninstall still leaves some crap in registery, and in Program files. Installation fails in the last step of the process - installation, about couple of minutes into it. Can't insert picture for you because serverfault does not allow me to do so. But it basically it: Error message: "Installation failed" I re-installed SQL 2008 Enterprise on this box and we are not going to go to R2 on older servers that previously had SQL 2005 or SQL 2008 on it. Looking at Windows log: Activation context generation failed for "C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\SQLServer2008R2\x64\Microsoft.SqlServer.Configuration.SqlServer_ConfigExtension.dll". Dependent Assembly Microsoft.VC80.CRT,processorArchitecture="amd64",publicKeyToken="1fc8b3b9a1e18e3b",type="win32",version="8.0.50727.4027" could not be found. Please use sxstrace.exe for detailed diagnosis.

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• Is Windows XP Pro not a good Hyper-V guest citizen?

  - by Magnus

  On my Windows Server 2008 R2 w. the Hyper-V role, I have these guest VMs: 3 x Windows Server 2008 R2 2 x Windows Server 2003 x86 2 x Windows 7 x64 1 x Windows XP Pro x86 In general, all machines are very fast and responsive. However, the Windows XP Pro guest is very sluggish. It can take up to 2 minutes to connect to the console/or a RD session. Sometimes it can "go into sleep" for several minutes. I have tried to add a 2nd CPU and more memory, but it doesn't help. When the issue happens, it's more or less impossible to get a responsive Task Manager up to analyze which process is hogging the CPU. But I have noticed that it can be various processes; lsass.exe, crss.exe etc. Integration Services is installed. Microsoft Security Essentials is installed, but I have tried without it, no difference. Any ideas?

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• Development Server Blocked Only from Home

  - by theonlylos

  Recently I've been having an issue with my CentOS 6 test server running Apache and Webmin running on port 10000 where when I try accessing any part of the server - SSH/FTP and even my domains (I have two - both keep getting timeout errors) when I try accessing from any computer on my home network. However when I access via tethering or via my office networks everything loads fine. While the firewall is the first issue at mind, my router never was set to block any special ports, and even after adding port 10000 as a specific exception I'm having no luck. Also, I doubt this is an IP blacklisting issue because I have websites on other servers using CloudFlare for security and I haven't gotten any warnings. Any assistance is greatly apprecaiated. UPDATE: Just some extra details about the issue: My ISP to my knowledge only blocks off ports 25 and 80 for residential users to prevent them from running web servers - however this issue has only come up a day or two ago, before that I was using the server successfully for months. Also the server is not physically located in any of my workspaces - it's a VPS housed in a datacenter

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• What response should be made to a continued web-app crack attempt?

  - by Tchalvak

  I've issues with a continuous, concerted cracking attempt on a website (coded in php). The main problem is sql-injection attempts, running on a Debian server. A secondary effect of the problem is being spidered or repeatedly spammed with urls that, though a security hole has been closed, are still obviously related attempts to crack the site, and continue to add load to the site, and thus should be blocked. So what measures can I take to: A: Block known intruders/known attack machines (notably making themselves anonymous via botnet or relaying servers) to prevent their repeated, continuous, timed access from affecting the load of the site, and B: report & respond to the attack (I'm aware that the reporting to law enforcement is almost certainly futile, as may be reporting to the ip/machine where the attacks are originating, but other responses to take would be welcome).

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• enable curl in cPanel control panel of a shared hosting for my account

  - by Jayapal Chandran

  I have hosted my site in a shared environment. Recently for security reasons the hosting company has disabled socket functions. When i enquired them they said that they will enable to people who personally request for that option. And they said it is a matter of 2 minutes work and asked for my control panel username and password. They said that it is just updating the php.ini for my account. So i want to know how to do it myself. If that could be done by them in 2 minutes then why cant a developer. I asked them but they mumbled... saying not to give trouble to me. so i want to know how to edit php.ini or something like stated above my hosting is using cPanel control panel. suggestions please.

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• Upgrading kernel on Debian server hosting Xen 3.2.1

  - by mitnosirrag

  I have a physical server running Debian 6 and Xen Hypervisor 3.2.1, and kernal -a says "2.6.26-1-xen-amd64". I have not updated for a long time, because when I run apt-get upgrade, one of the updates is linux-image-2.6-amd64. My understanding was that my kernel needs to have Xen support, will upgrading to this kernel break my dom0? I have myself up against a wall, because I host a VM for a website that isn't mine, so I need the latest security updates, but can't risk taking them offline. Eventually they will move off, and I won't be hosting something I am unqualified to host, but that isn't the point right now.

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• ajaxplorer: open_basedir restriction in effect

  - by mrzasa

  I'm trying to install ajaxplorer at a shared hosting in my home folder. When I navigate to the main page, I get an error: is_writable(): open_basedir restriction in effect. File(/var/lib/php5) is not within the allowed path(s): (/var/www//username/:/usr/sbin/sendmail:/usr/share/php :/home/www/appname::/usr/share/pear:/dev/urandom) What might be the cause? How could I fix it? There is php 5.3.3 installed, apache 2.2.16. I use ajaxplorer 4.0.4. EDIT: The problem is caused by this code part: $tmpDir = session_save_path(); $this-testedParams["Session Save Path"] = $tmpDir; if($tmpDir != ""){ $this-testedParams["Session Save Path Writeable"] = is_writable($tmpDir); Error appears in the last line, but I enclosed the context.

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• Making a cracked or activated windows uncracked

  - by ugurcode

  I have a pc which has windows 7 license but I installed windows from an image i downloaded and it is already activated. for validating genuine microsoft, i need to entet my own product key but the necessary activation tools do not exist in my windows folder. What do? I googled stuff but because the keywords are too broad I couldn't find a useful tool DAZ doesn't work, activation button doesn't show up. When I enter my original key to Windows Anytime Upgrade, I get this error When I attempt using slmgr, I get this error I used sfc /scannow Now slmgr is existing, I entered slmgr.vbs -ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX (replacing X es with the cd key) the operation successful. Now I have installed Microsoft Security essentials, which means the problem is solved. Main steps are here open cmd enter Enter "sfc /scannow" enter slmgr.vbs -ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX Success

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• What is the difference between "su --command" and "su --session-command"?

  - by oliver

  Running # su - oliver --command bash gives a shell but also prints the warning bash: no job control in this shell, and indeed Ctrl+Z and fg/bg don't work in that shell. Running # su - oliver --session-command bash gives a shell without printing the warning, and job control indeed works. The suggestion to use --session-command comes from Starting a shell from scripts using su results in "no job control in this shell" which states "[a security fix for su] changed the behavior of the -c option and disables job control inside the called shell". But I still don't quite understand this. When should one use --command and when should one use --session-command? Is --command (aka -c) more secure? Or should one always use --session-command, and --command is just left in for backwards compatibility? FWIW, I'm using RHEL 6.4.

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• Group Policy Task Schedule deployed to User Configuration not working, works when in Computer Configuration?

  - by user80130

  I added a Scheduled Task on my Windows 2008 R2 Domain Controller in the Group Policy Manager: MyDomain Policy User Configuration Preferences Control Panel Settings Scheduled Tasks Basic Task, like starting notepad, when user unlocks his workstation. This should show up in the client workstation's task scheduler, but it dosn't. No errors or anything like that. If I use the "Computer Configuration" instead of "User Configuration" the task appears, and I'm able to run the task. I've tried the gpupdate /force followed by gpresult and checked the report, but it dosn't contain the GPO Scheduled Tasks I created? (again, does show up when using "Computer Configuration".) The issue is that I have to run the application in the current users context, and only on a specific Employee OU, and thereby limit this task only to Employee Workstations and not apply the application when the same employee log on to internal servers and such. Primary domain dontroller is a Windows 2008 R2, workstations Windows 7 Enterprise. What am I doing wrong ?

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• Plesk 10 Postfix with multiple IP adresses and SSL certificates

  - by JulianB

  We are currently running a root server with Debian 6 and Plesk 10.4.4. We have some virtual hosts using one IP adress (shared) - e.g. example1.com - and another virtual host using a dedicated IP address (example2.com). Is there a way to configure postfix to do the following Always use the IP address of the virtual host to which the e-mail account belongs (so that an e-mail from [email protected] will originate from the shared IP-Address and an e-mail from [email protected] will originate from the dedicated IP? Use different certificates for TLS for example1.com and example2.com? If the latter is not possible: Could any problems arrive when using example1.com as certificate for example2.com users? Of course, example2.com users would have to configure their clients to use example1.com as the SMTP server name to avoid annoying security warnings. But if we still would be able to get the effect of the first point that would still be acceptable.

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• MS Access: Why can I no longer right-click to add a hyperlink?

  - by gef05

  I've been working in an MS Access system for a while now. It's a form system where users enter data, add links, contacts etc. Pretty simple. On the form is a hyperlink field. For months I could right-click the field, and from the popup context menu select Hyperlink Add a hyperlink (something like that). This would allow me to browse to a network location, select a folder, click okay, and have the path automatically added to the field. Then it stopped working. It works fine for everyrone else but not me. What's stranger, if I go to another machine and login, I get the functionality back. Any ideas?

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• Eclipse on mac: how comes that everytime I install an Eclipse plug-in on my mac I always get this er

  - by Patrick

  I'm using Eclipse for several projects on Leopard OSX. I've installed several versions (Classic, PDT, etc). When I install a new plug-in using the Help Install New Software functionality and I restart it, I always get the same error and I cannot anymore use it: !ENTRY org.eclipse.equinox.launcher 4 0 2010-04-20 17:32:42.540 !MESSAGE Exception launching the Eclipse Platform: !STACK java.lang.ClassNotFoundException: org.eclipse.core.runtime.adaptor.EclipseStarter at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:317) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:556) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514) at org.eclipse.equinox.launcher.Main.run(Main.java:1311) What is causing the error? How can I get these plugins to work? Thanks

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• Embedded video is not shown in internet explorer 9 RC or Beta

  - by Jagannath

  In IE 9 RC or in beta, the embedded video is not shown in the web page. I verified the security settings in "internet options". Did not find any issue. Please find the screen shot below. I am able to view the flash videos in Youtube. But, for some reason, in some sites the embedded video is not shown. I don't have this issue with firefox. UPDATE: I am able to see view the embedded video in Admin account. But not able to view it in Standard account.

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• MBSA: failed to create empty document

  - by Scott

  We just purchased a Windows-based VPS that I've been tasked to set up as a web server. It's running Windows 2003 Server Datacenter Edition. I downloaded the latest version of Microsoft Baseline Security Analyzer and installed it, but when I try to run it I'm given an error message "Failed to create empty document." A search on Google gave the suggestion to change the path of the TEMP and TMP environment variables, which I tried but it made no difference. I also saw suggestions that this problem is caused by MMC, but I was just in MMC setting up a user account. What am I missing?

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• WebDAV "PROPFIND" exception in IIS due to network share?

  - by jacko

  Hi all, We're finding continuous exceptions in our event viewer on our live box to the following exception: [snippet] Process information: Process ID: 3916 Process name: w3wp.exe Account name: NT AUTHORITY\NETWORK SERVICE Exception information: Exception type: HttpException Exception message: Path 'PROPFIND' is forbidden. Thread information: Thread ID: 14 Thread account name: OURDOMAIN\Account Is impersonating: True Stack trace: at System.Web.HttpMethodNotAllowedHandler.ProcessRequest(HttpContext context) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) Other Specs: Windows Server 2003 R2 & IIS 6.0 We've narrowed it down to occuring when people try to access shares on the box from within the network, and have discovered (we think) that its due to the WebDAV web services extension being previously disabled by past staff. The exceptions are being thrown when trying to access directories that are virtual dirs in IIS, and plain old UNC network shares What the implications for enabling the WebDAV extensions on our live web server? And will this solve our problems with the exceptions in our event log?

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• sshd warning, "POSSIBLE BREAK-IN ATTEMPT!" for failed reverse DNS

  - by rking

  Whenever I SSH somewhere I get something like this in the logs: sshd[16734]: reverse mapping checking getaddrinfo for 1.2.3.4.crummyisp.net [1.2.3.4] failed - POSSIBLE BREAK-IN ATTEMPT! And it is right: if I do host 1.2.3.4 it returns 1.2.3.4.crummyisp.net, but if I do host 1.2.3.4.crummyisp.net it is not found. I have two questions: What security threat is there? How could anyone fake a one-way DNS in some threatening way? Do I have any recourse for fixing this? I'll send my ISP a bug report, but who knows where that'll go.

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• securing source code with bitlocker

  - by Daniel Powell

  We need to deploy a web based application at a client site where it will be within their local intranet. Part of our requirement is to provide some basic security to protect our IP. I realise that nothings a 100% guaranteed fix but we are just looking to make it a bit harder for most people. The server will be running server 2008 and I was considering using bitlocker as a cheap and nasty way to protect it. From what I understand assuming the mobo supports it we can use the Transparent bitlocker mode and this means that moving the hdd to another pc will mean the hdd will be unreadable in that machine baring some sort of cold boot attack to steal the encryption keys. Is this assumption correct and in the case that the motherboard or any other component fails in the pc and we need to replace it do we lose access to our data or is there a way to unencrypt it (obviously accessible to only our company) EDIT: we do have legal documents that cover this and we will be locking the pc physically and the client will not have access to the pc (windows login) other than via the website we host on it

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• Why my pendrive is showing used space when it is actually empty?

  - by Deb

  I recently got some virus in my pendrive. I removed them using Microsoft security Essential and cleared all data. But it is showing that 47.1MB of space is being used. Is it due to the virus affect? There is no hidden files on the pendrive and I have also set Show hidden files in the Folder and search option. Permission is also granted to everyone. I also use disk management to check any issue but nothing found. I think formatting will solve the the problem but in that case I will not be able to see the data. Is there any command to see the files in cmd or any other way?

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• How to execute with /bin/false shell

  - by Amar

  I am trying to setup per-user fastcgi scripts that will run each on a different port and with a different user. Here is example of my script: #!/bin/bash BIND=127.0.0.1:9001 USER=user PHP_FCGI_CHILDREN=2 PHP_FCGI_MAX_REQUESTS=10000 etc... However, if I add user with /bin/false (which I want, since this is about to be something like shared hosting and I don't want users to have shell access), the script is run under 1001, 1002 'user' which, as my Google searches showed, might be a security hole. My question is: Is it possible to allow user(s) to execute shell scripts but disable them so they cannot log in via SSH?

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• Mono on Linux: Apache or Nginx

  - by Furism

  Hi, I'm developing an ASP.NET application that will be run under Linux/Mono for various reasons (mostly to stay away from IIS, quite frankly). Of course the first web server I had in mind was Apache. But Apache, for all its advantages, adds a lot of overhead. Also, the application I'm building needs to be highly scalable and performance is one of the main concern. Apache has, obviously, a very good reputation and its record speaks for itself, but I don't need things like Reverse Proxy or Load Balancing because dedicated network devices would be used for that. So those modules from Apache will never be used. So basically my question is: since Nginx seems to fit exactly needs, is there any caveat I should be aware of? For instance, is Nginx renowned to be particularity safe? When security flaws are detected, how fast are they patched? Any insight on the pros and cons of using either of those servers in conjunction with Mono is welcome.

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• IPSec policies on Mac OSX

  - by Helder

  Is there a way to configure IPSec policies on a Mac OSX, in a similar way to what you can do in Windows, with "Connection Security Rules"? I need to implement a service that will use an IPSec tunnel, and I might have to provide it to Macs as well. As I don't have access to a Mac, I've done some reading, and it seems that there is something called "racoon" that handles IPSec. Can anyone confirm this? Further, we will need to use certificates for authenticating the IPsec tunnel as well (as opposed to pre-shared keys). Can anyone confirm that this is also possible from a Mac OSX? Thank you!

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