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How to Add User to Sudoers File on Ubuntu / Debian

Sudo is a program that allows users to run programs with the security privileges of another user (normally the superuser, or root). The /etc/sudoers file controls who can run what commands as what users on what machines and can also control special things such as whether you need a password for particular commands. To add […]

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How to Install Fail2ban on Debian Squeeze

Fail2ban is an important software for system administrator. It scans log files (e.g. /var/log/auth.log) and bans IPs that show malicious signs, something like too many password failures and looking for exploits. To install fail2ban, execute this command: Open the configuration file to activate some rules: Find following line to set email destination for notification: Find […]

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How to Fix Suhosin Error ‘ALERT – configured GET variable value length limit exceeded…’ on Debian Squeeze

PHP Suhosin is an open source patch for PHP5 to harden the servers security. I found this Suhosin looping error message when checked on /var/log/user.log Feb 25 07:28:39 rastavarian suhosin[444]: ALERT – configured GET variable value length limit exceeded – dropped variable ‘cookie’ (attacker ‘202.42.246.191’, file ‘/var/www/wp-admin/admin-ajax.php’) Feb 25 07:28:40 rastavarian suhosin[442]: ALERT – configured […]

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How to Install Spamassasin, ClamAV, Amavis on Ubuntu / Debian Squeeze

The purpose of this installation is to filter spam email and virus on Postfix mail agent. Here I already installed Postfix in the server, because it is included in EHCP installation. 1. Install the packages 2. Install the optional packages for better spam detection libmail-spf-query-perl package is not available in Debian, therefore I change to […]

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