Blog: SSH Connection Refused after Ubuntu upgrade

We recently ran an apt-get upgrade on one of our servers and suddenly could no longer SSH into it.  We kept getting a 'connection refused' message, despite having been in there seconds before.

We checked the network and followed the instructions here to test that SSH was working correctly and listening on the right port.  Once that was done, and the problem remained, we took a look at the /etc/ssh/sshd_config file.

For some reason the entry

ListenAddress ::

had been added back into the file.  Luckily we had a backup file where we could see it was commented out.

The ListenAddress allows you to bind the SSH process to a specific IP address (which isn't necessarily the same one as the server is listening to public connections from).  It's an extra layer of security - if you have the luxury of extra IP addresses.  Roll on IPV6.

We don't, so we commented the line back out again

#ListenAddress ::

restarted openssh, and we could get back in.

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