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.
So every time someone gets banned the fail2ban server restarts.
Here are a couple of logs.
2012-03-23 00:58:39,025 fail2ban.actions: WARNING [dovecot] Ban xx.xx.xx.xx (ip removed)
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.
2012-03-23 00:58:39,025 modprobe: FATAL: Module ip_tables not found.
Iptables is present and running - and I can issue any commands without iptables failing or fail2ban crashing.
Please let me know if you have any idea and if you would need the fail2ban config files
Edit:
I have been able to narrow it down to this iptables rule causing the errors:
iptables -I INPUT -p tcp -m multiport --dports 110,995,143,993 -j fail2ban-Dovecot
Why would this multiport rule cause this error?
2012-03-23 00:58:39,025 modprobe: FATAL: Module ip_tables not found.
System Information:
Centos 5.8 Fail2ban 0.8.2 Iptables 1.3.5
