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What does it mean when SSH says the key changed?

Red Squirrel

Red Squirrel

No Lifer
I physically moved my local server to my new house and since it was offline for a while I'm forcing all the backup jobs to run now.

I got this huge warning that the host identification key changed on my web server and that I'm being hacked with a man in middle attack.

What's up with this, is that really the case, or is it just exaggerating? Is it because my IP changed from the server move?
 
Usually it only throws that if you had a different machine on the same IP before

I.e. server1 is 192.168.1.2; server2 is 192.168.1.3.
Server1 blows up in a fire.
Server2 is somehow assigned server1's old IP.
The cached key (from server1) no longer matches 192.168.1.2; because this is now server2.

That's my understanding, at least; and the only circumstances I've had when it bitches about it.
 
Oh ok so nothing really to worry about then? I had to clear a line in a text file to connect and I was good to go from that point.
 
In your case, I don't think it is something to worry about. If you had made no changes and that error popped up all of a sudden it would be something to worry about.
 
the above could be possible. also a successful man in the middle attack would change your cert.
 
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