~/src/phacility/core (cloudformation) $ ssh ubuntu@ec2-52-53-74-79.us-west-1.compute.amazonaws.com
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@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
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IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:11ia3NRL2FfyWKJYPmc+6bbGea/2SSMyOFjSXvj1OjQ.
Please contact your system administrator.
Add correct host key in /Users/amckinley/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/amckinley/.ssh/known_hosts:24
ECDSA host key for ec2-52-53-74-79.us-west-1.compute.amazonaws.com has changed and you have requested strict checking.
Host key verification failed.
~/src/phacility/core (cloudformation) $ vim /Users/amckinley/.ssh/known_hosts
~/src/phacility/core (cloudformation) $ ssh ubuntu@ec2-52-53-74-79.us-west-1.compute.amazonaws.com
The authenticity of host 'ec2-52-53-74-79.us-west-1.compute.amazonaws.com (52.53.74.79)' can't be established.
ECDSA key fingerprint is SHA256:11ia3NRL2FfyWKJYPmc+6bbGea/2SSMyOFjSXvj1OjQ.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'ec2-52-53-74-79.us-west-1.compute.amazonaws.com,52.53.74.79' (ECDSA) to the list of known hosts.
Received disconnect from 52.53.74.79 port 22:2: Too many authentication failures
Authentication failed.