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== known_hosts ==
===Remove offending key===
If when trying to connect to a host you get the message:
Offending ECDSA key in /home/user/.ssh/known_hosts:#:
and you trust the host (this can happen when you change CNAME file of your DNS to point to a different server
ssh-keygen -f "/home/user/.ssh/known_hosts" -R server_dns_or_ip