Linux hints

After reinstalled Ubuntu in my laptop, I tried to ssh laptop from Fedora computer. I got following error message:

[czhang@F13-64-VM projects]$ ssh czhang@10.0.0.124

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@    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

4e:b4:d9:05:e3:b3:81:3c:1a:f6:79:64:c1:23:b7:83.

Please contact your system administrator.

Add correct host key in /home/czhang/.ssh/known_hosts to get rid of this message.

Offending key in /home/czhang/.ssh/known_hosts:3

RSA host key for 10.0.0.124 has changed and you have requested strict checking.

Host key verification failed.

This is because the RSA host key has changed since reinstalled the system.
Just remove the RSA key will solve the problem.

$ rm /home/czhang/.ssh/known_hosts