I was configuring fail2ban on ubuntu server 12.04. I added a new action that was supposed to send me mail one somebody would be banned on attempt to hack ssh.
I was looking at logs:
tail -f /var/log/fail2ban.log
service fail2ban restart
It all went good. I modified text of the mail and did restart again.
This time tail didn't show any activity, I saw how fail2ban shut of its services but it would not turn on. I tried few times to start it while watching logs and nothing would indicate problem.
I decided to go system restart (big mistake). And now server doesn't come online. I'm waiting for my friend to turn it on manually (its in remote location). Till that I cannot do anything but be nervous that I screw up something, since I'm such a newbie.
Any ideas what happened? I guess this would be hard to answer without actual logs. But I wonder how could fail2ban interfere with boot sequence? why would server not wake up even if I blasted fail2ban package?