sshd issues after upgrade to 14.3

I did a long overdue upgrade from 13.2 > 13.5 then to 14.3

I have ended up with a broken sshd.

The initial issue was that sshd wouldn't start, reporting sshd-session wan't found in /usr/libexec. It was at /usr/local/libexec/sshd-session
copied it over and sshd started.

The sshd starts, but clients reported kex_exchange_identification: Connection closed by remote

Tried removing /etc/ssh/ssh_host_* and restarting sshd.
Now clients connect, but that is it.

Other things seem ok, but I haven't been able to progress with rebuilding the database & web apps yet.

any tips to find the cause or reinstall the base 14.3 over the top?
 
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