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• Why do I get "Permission denied (publickey)" when trying to SSH from local Ubuntu to a Amazon EC2 server?

  - by Vorleak Chy

  I have an instance of an application running in the cloud on Amazon EC2 instance, and I need to connect it from my local Ubuntu. It works fine on one of local ubuntu and also laptop. I got message "Permission denied (publickey)" when trying to access SSH to EC2 on another local Ubuntu. It's so strange to me. I'm thinking some sort of problems with security settings on the Amazon EC2 which has limited IPs access to one instance or certificate may need to regenerate. Does anyone know a solution?

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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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• 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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• 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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• 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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• What does S in linux file properties mean?

  - by penguin

  I'm creating directories and changing the permissions of them in perl with the following code: umask 0000; mkdir $path, 0770; chown $userid, $groupid, $path; Now when I do ls -l on a directory I've just created, they are as follows: drwxrws--- 2 user group 4096 Nov 3 15:34 test1 I notice for the group permissions, there's an s instead of x. Even if I chmod manually to remove all permissions for the user and group ("chmod g=" and "chmod u=", it's still there: d-----S--- 2 user group 4096 Nov 3 15:36 test2 The internet suggests S means everything in the folder is run as su or something? I don't quite understand what it means but I figure I should understand seeing as these are webroots so if there's a security implication, I ought to be aware of it. Many thanks for your help!

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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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• 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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• 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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• 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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• 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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• How to disable the second partition without unmount it in Mac?

  - by bagusflyer

  I've installed OSX Yosemite in another partition in my Mac. But there is a problem. For example, I installed iBooks in both partition. When I right click one of my epub or pdf file, both iBooks are shown in my context menu. This is not what I want. What I want is to only allow the apps in Yosemite shown. Of course I can disable apps in my old Maverick partition by unmount the volume. But again this is not what I want because it will hide the partition when I boot my machine so that I can't boot up into my Maverick partition. Can anybody advise if there are any better ideas? Thanks

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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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• 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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• 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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• 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 does RAM fail?

  - by ethanlee16

  I have an issue with a Dell Inspiron 15 (1545) laptop that refuses to open any applications (save select Microsoft programs, e.g. Security Essentials, Ctrl Panel, Windows Explorer (not Internet), regedit, Event Viewer, etc.). I've run Microsoft Memory Diagnostics Tool and it found a 'hardware problem was detected.' Does this indicate that the RAM has failed? I notice when I open programs like Word, Excel, Internet Explorer, etc., it always give me an error from WerFault.exe saying The instruction at xxxxxxx referenced memory at xxxxxxxxx. The memory could not be written. and sometimes something about illegal instructions. If it is a hardware problem, does this mean that replacing the RAM is my only option? Again, I would also like to know if RAM can fail (like hard drives) and if malware can cause RAM to fail also.

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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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• 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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• 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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• How to add the Windows defender into Windows Explorer's right click menu to scan a particular drive/folder/file on demand?

  - by avirk

  There is no option in Windows Explorer to scan a particular drive (or file) on demand by right clicking on it in Windows Explorer as we had in Windows 7 with Microsoft Security Essentials or like other antivirus solutions. I know we can run a custom scan for the particular drive or specific folder but that process is too lengthy and time consuming. The guide How to Add a "Windows Defender" Cascading Desktop Context Menu in Windows 8 explains how we can add Windows Defender in the desktop right click menu, so I'm curious, is there a way to add it in the Windows Explorer right click menu to launch a search whenever I need to?

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• BCM 2007 not opening contacts...

  - by Christopher

  Business Contact Manager for Outlook (2007) is refusing to open contacts. This problem appeared this morning on every machine (Windows XP SP3) on our network. The contact list does populate as normal, and contacts can be printed from the context menu, but the form that displays the contact information does not display, and no error message is thrown. I have turned on logging for BCM in the help menu, but nothing is being generated (or, leastways, I cannot find it anywhere). The SQL services appear to have started as normal. Anyone come across this before I take a deep breath and go with my boss' suggestion of "just reboot the server"? Any other information you need? Thanks.

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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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