I upgraded two servers from 12.3-RELEASE to FreeBSD 12.4-RELEASE yesterday, and both servers allowed ssh logins initially, but then after some time ssh log in to the servers from elsewhere stopped working with messages of the form
I logged in to the servers using a keyboard and monitor and restarted the servers with
and then things started working perfectly again.
I have searched with the site search and google for this message but did not find anything. I was able to solve this problem by restarting sshd so I don't need any help at the moment, but I thought it might be worth bringing up on the forum in case there is something I've missed.
kex_exchange_identification: Connection closed by remote host
I logged in to the servers using a keyboard and monitor and restarted the servers with
service sshd restart
and then things started working perfectly again.
I have searched with the site search and google for this message but did not find anything. I was able to solve this problem by restarting sshd so I don't need any help at the moment, but I thought it might be worth bringing up on the forum in case there is something I've missed.