ssh connection died, can't reconnect.

I was in the middle of an ssh session to and in the middle of typing it displayed "Broken Pipe"

I tried to reconnect and not it's saying:

ssh: connect to host port 22: Connection refused

I've tried this from multiple networks and it's the same issue.

Seems to have come back after about 5 minutes.

We do occasionally have to restart servers for maintenance, that could have happened here. Let us know if you spot anything else unusual?