@ 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
linux相关用户ssh,scp等远程连接的公钥(public key)都记录在/home/username/.ssh/known_hosts,当下次访问时，如果公钥不同，则会报如上的错误。
solution:
vim /home/username/.ssh/known_hosts
找到你连接的主机对应的公钥，直接delete。
本文出自 “ORACLE” 博客，请务必保留此出处http://2012ivan.blog.51cto.com/5241776/1975879
原文：http://2012ivan.blog.51cto.com/5241776/1975879