Cave 5

Locally add the following to ~/.ssh/config ServerAliveInterval 120 # null packet every 120 seconds On the server side add the following: ClientAliveInterval 120 # null packet every 120 seconds ClientAliveCountMax 720 # 24hs Done!

To search all the ips that were banned we enter interactive mode: $ fail2ban-client -i Then we check a jail status, for example sshd : > status sshd the output: Status for the jail: sshd |- Filter |  |- Currently failed: 0 |  |- Total failed: 27 |  `- File list: /var/log/auth.log `- Actions    |- Currently banned: 37    |- Total banned: 38    `- Banned IP list: <a big list of banned ips> So, if we want to unban a particular ip address, let's say X Then, we execute: > set ssh unbanip (within interactive mode) Lastly, if you want to execute it directly from command line: $ fail2ban-client get <JAIL> actionunban <IP-ADDRESS> That's all.