i got this error from my my school ssh... can someone explain to me if something is wrong with my computer, or if im in danger...

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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 the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
xx.xx.xx.xx.xx.xx.xxx.xx.x.x.x.x.x..
Please contact your system administrator.
Add correct host key in /home/atlantis/.ssh/known_hosts to get rid of this message.
Offending key in /home/atlantis/.ssh/known_hosts:1
RSA host key for 2pac.cs.colostate.edu has changed and you have requested strict checking.
Host key verification failed.

1.The administrator of the remote host computer has changed the identification method.
2.The administrator of the remote host computer has changed the IP address (or the host name) of the remote host.
3.The administrator of the remote host computer has upgraded the system from Secure Shell version 1 server to Secure Shell version 2.
4.An intruder is trying to pose as the remote host computer.
(snip from ssh.com)

If you know it's all OK then can solve this error and connect by removing the line in your "/home/atlantis/.ssh/known_hosts" that starts with "2pac.cs.colostate.edu" or "129.82.47.81". As for any other host you want to connect to.

the easiest way to solve that problem is to delete the known_hosts file in the .ssh directory. if you can't find it try 'locate known_hosts'