Warning: Remote Host Identification Has Changed

I met this problem today morning after I started the sshd service. I think it is because I just updated my Fedora recently, and the ssh known_hosts file in your home directory should be updated too. There are 3 solutions to solve this,

The simple solutions to this problem are:
$ cd
$ rm .ssh/known_hosts
$ ssh ras.mydomain.com
or just:
ssh-keygen -R server.example.com

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