On 9/12/21 6:12 PM, Ranjan Maitra wrote:
However,  I can no longer do as password-less connection, it worked fine till 
about 30 hours ago.  What could be wrong? Both machines are automatically 
updated, the one at localhost at 21:00 hours CT (US) and the other (remote 
server) at 03:00 CT (US) everyday. But the connection did work fine even after 
the two machines got updated for a while, till around 12:00 yesterday (I can 
not pinpoint the exact time it last worked).

Check if the config has changed (most likely on the server side). You say the machines are automatically updated, but are they rebooted after the update? Assuming they aren't and sshd was updated, then it's hard to say if or when the updated server or config would come into effect. Check the dnf history and see if there are any relevant updates recently.
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