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I've been researching this problem for the past 4-5 days, but to no avail. SSH refuses to log in from remote computer. Ubuntu 20.04 server is running on server on local network.

So far:

1. I'm able to ftp, ssh, telnet, vnc to a local server from computers on the same local network: no problem

2. From a remote location I'm able to ftp, telnet, vnc to local server but ssh refuses to connect to the server

3. more info:

  • modem forwards port 22 to local server (the same for ports 21 & 23 & 80 & ...)

  • sshd is up and running on the server

  • ufw configured to grant access to port 22: Action ALLOW IN from "Anywhere" (checked by issuing commands ufw status numbered and ufw status verbose).

  • service ufw status reports ufw is active

  • lsof i -n -P|grep LISTEN reports port 22 is listening

  • ssh -vvv IP_Address from remote computer reports this error message: async io completed with error: 10061" & connection fails

  • /var/log/auth.log logs the following item after connection refused: Received signal 15; terminating which means "some" process has issued a SIGALRM & kernel killed connection attempt

At this point, I believe "something" (in ssh configuration files or elsewhere) is blocking remote connections to ssh, but I don't know where to look at this point. Answers to this previously posted problem have resulted in "generic answers" with no meaningful answers.

karel
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pelletie
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