technology/linux/general/ssh.md
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@@ -34,6 +34,13 @@ ssh -X user@host
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```
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- on server side `X11Forwarding` must be set to `yes` in '/etc/ssh/sshd_config'
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+## remote host id has changed
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+if the fingerprint for the remote host has changed (and you are sure it's not
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+a mitm attack) run the following to remove from 'known_hosts'
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+```
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+ssh-keygen -f $HOME/.ssh/known_hosts -R <hostname>
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+```
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+
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## ref
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[ssh][] guide
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