Question:
ssh: Could not resolve hostname : Name or service not known
root@ubuntu:/home/rex# ssh rex@10.82.211.88
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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 the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
d2:4a:5e:1f:2b:4e:f9:dd:70:58:36:61:96:3a:cb:8c.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending key in /root/.ssh/known_hosts:1
RSA host key for 10.82.211.88 has changed and you have requested strict checking.
Host key verification failed.
solution:
root@ubuntu:/home/rex# rm /root/.ssh/known_hosts
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