/root/.ssh/known_hosts updated.
Original contents retained as /root/.ssh/known_hosts.old
[root@zjxl-100 jenkins]# scp jenkins.plugins.publish_over_ssh.BapSshPublisherPlugin.xml 192.168.19.47:/yanf/jenkins.plugins.publish_over_ssh.BapSshPublisherPlugin.xml
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ 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
1b:1a:81:72:b3:fc:d8:67:dd:64:e2:34:e3:8d:ed:93.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending key in /root/.ssh/known_hosts:1
RSA host key for 192.168.19.47 has changed and you have requested strict checking.
Host key verification failed.
lost connection
***********解决办法***************
cd ~/.ssh rm known_hosts
原文：http://my.oschina.net/yangting880815/blog/493898