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...and then if the fingerprint changes, you get something like this:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@@@ WARNING! THIS ADDRESS MAY BE DOING SOMETHING NASTY!! @@@

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

... and then you do rm .ssh/known_hosts and try again :P

ssh-keygen -f ~/.ssh/known_hosts -R 123.45.67.89

You have probably just saved me.. minutes of time over the course of a year!

But seriously thanks, I was going into the known_hosts file and manually deleting the offending line :)

If you get past the terrifying warning, it even gives you the command to copy and paste. You don't even have to type it!