I have a strange problem and I'm not sure where to begin. My ssh client works on some servers but times out on others.
Obviously, I checked that the servers are accessible via ssh from other locations. From my machine A I can log on to C only by logging on to B first. There are at least two servers for which this is the case. To make matters more strange
sudo ufw status->
nmap -sT -p 22 <problem_server>-> ...
22/tcp open ssh...
On one affected server I am getting:
ssh_exchange_identification: Connection closed by remote host and on the other I am getting
ssh: connect to host <problem_server> port 22: Connection timed out
With both of these servers I can log in from other machines. How can I troubleshoot such a problem?