title: Fail2ban random restarts when banning ip
body: <p>I have been running fail2ban on my server for a while without any problems but have recently seen fail2ban restart randomly. After some looking in my logs I noticed that the restarts occur when ever someone gets banned.</p>
  
  <p>So every time someone gets banned the fail2ban server restarts.</p>
  
  <p>Here are a couple of logs.</p>
  
  <pre><code>2012-03-23 00:58:39,025 fail2ban.actions: WARNING [dovecot] Ban xx.xx.xx.xx (ip removed)
  </code></pre>
  
  <p>What I have been able to find out is that the fail2ban bans the IP and then it restarts and the only error I can find is.</p>
  
  <pre><code>modprobe: FATAL: Module ip_tables not found.
  </code></pre>
  
  <p>Iptables is present and running - and I can issue any commands without iptables failing or fail2ban crashing.</p>
  
  <p>Please let me know if you have any idea and if you would need the fail2ban config files </p>
  
  <p>System Information:</p>
  
  <ul>
  <li>Centos 5.8 </li>
  <li>Fail2ban 0.8.2 </li>
  <li>Iptables 1.3.5</li>
  </ul>