Use apt-get to install openssh sshd on Ubuntu: sudo apt-get install openssh-server

This is a howto about scanning emails for viruses on Ubuntu with ClamAV: How would I go about scanning my email for viruses and other nasties?

The SELinux security context for files is stored in the form of an extended file attribute. To remove security context in a file: setfattr -x security.selinux file_name But you have to boot with SELinux disabled before you can do that. To restore security context in a file: restorecon -v file_name

From Fedora Project wiki : A security context , or security label , is the mechanism used by SELinux to classify resources, such as processes and files, on a SELinux-enabled system. This context allows SELinux to enforce rules for how and by whom a given resource should be accessed. A security context is typically shown as a string consisting of three or four words. Each word specifies a different component of the security context, namely, the user , role , type , and level of that file or process . Each word is separated by a colon. Use the -Z switch to display security context info. Display security context for Apache files: $ ls -Z /var/www/ drwxr-xr-x. root root system_... Display security for files under...

By default SELinux blocks execstack permission. According to Ulrich Drepper : "As the name suggests, this error is raised if a program tries to make its stack (or parts thereof) executable with an mprotect call. This should never, ever be necessary. Stack memory is not executable on most OSes these days and this won't change. Executable stack memory is one of the biggest security problems. An execstack error might in fact be most likely raised by malicious code." You can check if a library/application requires execstack by using the execstack utility: execstack -q PATHTOPROGRAM You can try to clean the flag and see if the application still runs: execstack -c PATHTOPROGRAM To allow execstack for cc1 : # grep cc1 /var/log/audit/audit.log | audit2allow ...

You get "permission denied" error from Apache HTTPD for a page. And you checked file/directory permissions (the whole directory path, not just the file) and everything in httpd.conf . If everything seemed right, then SELinux may be blocking the access. Open /var/log/httpd/error_log , you may see a line like this: [Wed Apr 13 15:50:35 2011] [notice] SELinux poli... These are the steps to fix: If the directory resides in a user home directory: # setsebool -P httpd_read_user_content 1 Create a policy package from the audit log: # grep httpd /var/log/audit/audit.log | audit2allo... Apply the policy package just created # semodule -i mypol.pp Restart apache httpd: # apachectl restart

Normally an icon displays automatically in the status area (upper right corner) when an AVC denial happens. But in case you need to bring up the SELinux alter browser manually, here's the command: $ sealert -b

You can check SELinux status by /usr/sbin/sestatus : $ /usr/sbin/sestatus SELinux status: ... SELinux audit log is available from: /var/log/audit/audit.log

PostgreSQL jdbc connection string: jdbc:postgresql://<hostname>:<port>/<database_name> . Example code: // register JDBC driver with DriverManager Clas...

Sometimes you want to disable the UAC because a program written for XP doesn't have the notion of UAC. When running such a program under Windows 7, it silently denies your preference changes. Enter Control Panel, goto User (Account) Manager. Click the link "Change User Account Control Settings". Move the slider to the bottom