How to fix and issue on client side where you get a warning like one below
WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!
type the below command:
ssh-keygen -R [your domain name or IP address].
You should see below output
# Host 10.0.0.12 found: line 7 type RSA
Original contents retained as /Users/johinc/.ssh/known_hosts.old
There after you may proceed connecting to your ssh server