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If you use vi, the command "vi +634 /Users/pepper/.ssh/known_hosts" will open the file to line 634 for editing.

Then you can ssh into the server again, accept the new key (just type 'yes' at the prompt), and continue normally.

The last time this happened to many users was March 25th, 2021. We replaced the old lilac-ln01 login server with the backup lilac-ln02 login server, which had a different hostkey and generated an alert for each lilac user when they connected to the new server.