[ubuntu] SSH doesn't work any more

http://ubuntuforums.org – Hello, My SSH connection doesn't work any more. I have two Computers A and B, which are in the same home-network. This morning a was still able to connect by SSH from A to B. I did some general configuration on B so I might have messed up something, but I have no clue what it could be, as, as far as I can remember only accessed the /usr/share folder. Then I switched B off and worked on A. After some hours I restarted B again, but couldn't connect any more from A to B. On A: Code: $ ssh myname@B ssh: connect to host B port 22: Connection refused. but on B: Code: $ ssh myname@A works. After some testing I rebooted both A and B, without any result. Also disabling the firewall on both A and B didn't change anything. Code: $ sudo ufw disable Pinging from A to B and vice-versa works. On A: Code: $ ssh localhost works. But on B: Code: $ ssh localhost ssh: connect to host localhost port 22: Connection timed out On A: Code: $ netstat -lnptu Proto Recv-Q Send-Q Local Address          Foreign Address        State      PID/Program name tcp        0      0 0.0.0.0:65487          0.0.0.0:*              LISTEN      2208/wish8.5    tcp        0      0 0.0.0.0:22              0.0.0.0:*              LISTEN      -              tcp        0      0 127.0.0.1:631          0.0.0.0:*              LISTEN      -              tcp6      0      0 :::139                  :::*                    LISTEN      -              tcp6      0      0 :::22                  :::*                    LISTEN      -              tcp6      0      0 ::1:631                :::*                    LISTEN      -              tcp6      0      0 :::445                  :::*                    LISTEN      -              udp        0      0 0.0.0.0:5353            0.0.0.0:*                          -              udp        0      0 ***.***.***.***:137    0.0.0.0:*                          -              udp        0      0 0.0.0.0:137            0.0.0.0:*                          -              udp        0      0 ***.***.***.***:138    0.0.0.0:*                          -              udp        0      0 0.0.0.0:138            0.0.0.0:*                          -              udp        0      0 0.0.0.0:54162          0.0.0.0:*                          - But on B: Code: $ sudo netstat -lnptu Proto Recv-Q Send-Q Local Address          Foreign Address        State      PID/Program name udp        0      0 0.0.0.0:5353            0.0.0.0:*                          992/avahi-daemon: r udp        0      0 0.0.0.0:44693          0.0.0.0:*                          992/avahi-daemon: r It seems that B isn't listening on port 22. I hope I provided enough informations, I would be happy for any help! :) Regards, CHW (HowTos)