Cisco-Education wrote: <snip> > Jun 19 16:26:06 kmdns1 sshd[11073]: Invalid user jeka from 87.118.122.78 > Jun 19 16:26:06 kmdns1 sshd[11074]: input_userauth_request: invalid user jeka > Jun 19 16:26:06 kmdns1 sshd[11074]: Received disconnect from > 87.118.122.78: 11: Bye Bye <snip> > Now both the Mail server and the backup pc server behind firewall and ssh > protocol is denied to the hosts in the DMZ zone doesn't look like it :-) check your firewall, ssh is definitely getting through to that mail server.