REMOTE HOST IDENTIFICATION HAS CHANGED!

오류 메세지 혹은 현상

• ssh 연결 시 에러 발생 
  

  ssh <USER>:<IP Address>
  @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ 
  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 a host key has just been
  changed. The fingerprint for the RSA key sent by the remote host is 
  f9:64:1a:19:11:85:d4:06:d9:47:7f:f7:da:50:8a:f9. Please contact your system administrator.
  Add correct host key in /Users/CPUU/.ssh/known_hosts to get rid of this message. Offending 
  RSA key in /Users/CPUU/.ssh/known_hosts:2 RSA host key for 192.168.0.7 has changed and you 
  have requested strict checking. Host key verification failed.

  
  

  
  

원인

• IP 로 접속 기록이 있는 서버와 RSA 공유키를 교환한 상태로, 서버가 바뀌게 되면 같은 IP 를 사용하게 되어 충돌이 난 상황입니다. 

문제 해결

• 공유된 기록을 초기화 한 뒤 ssh 명령어를 실행하여 접근합니다. 

  ssh-keygen -R <IP_Address>

  ssh-keygen -R 192.168.50.203
  # Host 192.168.50.203 found: line 2
  /root/.ssh/known_hosts updated.
  Original contents retained as /root/.ssh/known_hosts.old