I have a computer using F8 that I manage, having just checked the security log files I see atempts are being made ona daily basis to hack in using ssh on port 22
I have jus done a nmap scan and have also found the below
Discovered open port 53/tcp - does this ned to be open
20/tcp closed ftp-data
21/tcp closed ftp
22/tcp open ssh OpenSSH 4.7 (protocol 2.0)
23/tcp closed telnet
53/tcp open domain?
80/tcp open http?
TCP Sequence Prediction: Difficulty=199 (Good luck!) - is this good?
I have root access to the computer, can someone advise on how I edit the firewall by cli please.