RSA key problem.

[w3nd1go]

I get this when trying to ssh into Debian from my Mac.

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @@@@@@@@@
@ 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
05:1f:2b:e8:8b:be:61:39:34:5b:06:4c:17:df:95:9e.
Please contact your system administrator.
Add correct host key in /Users/beeee/.ssh/known_hosts to get rid of this message.
Offending key in /Users/beeee/.ssh/known_hosts:6
RSA host key for 192.168.0.4 has changed and you have requested strict checking.
Host key verification failed.
carnage:~ beeee$

What caused this?
Don't know what to do about it either.
The problem isn't with the Debian machine it's with the Mac.
The Mac expects a different RSA fingerprint from the Debian machine for some reason.
But nothing changed to cause this.
I know that if I were to change the netconfig of the Debian box, the key changes and this will happen.
But I didn't change it.

[w3nd1go]

It was as simple as typing "open .ssh" into terminal then deleting the 'known_hosts' file, close terminal reopen it and ssh into the remote machine.