ssh "inputstream is closed"

[JonMikelV]

I use SFTP connections for some backups and recently they ALL stopped working.  Assuming this meant a server issue I reviewed my "Settings" -> "SSH" config and everything LOOKED fine but SFTP connections still return "inputstream is closed" and SSH connections result in:

hostfile_replace_entries: link /root/.ssh/known_hosts to /root/.ssh/known_hosts.old: Operation not permitted
update_known_hosts: hostfile_replace_entries failed for /root/.ssh/known_hosts: Operation not permitted

 

I've tried the ssh-keyscan fix suggested elsewhere, but it doesn't seem to do anything (backup copy of known_hosts matches result of ssh-keyscan).

ssh-keyscan -H TARGET_HOST >> ~/.ssh/known_hosts

 

In all cases a `tail -f /var/log/syslog` shows "accepted password for <user> from <ip> port <numb> ssh2".

 

I've tried enabling "Permit Root Login" in the SSH Settings page but that doesn't seem to make any difference.

 

Thanks in advance for any suggestions on how to further debug / resolve this!