昨天登录好的，今天已登录提示如下：
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ 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 SHA256:BL+HuRQcU6BvdyrWeN3bGjfyAiA9uUFs/u/seBspQ5Q. Please contact your system administrator. Add correct host key in /home/bc/.ssh/known_hosts to get rid of this message. Offending RSA key in /home/bc/.ssh/known_hosts:5 remove with: ssh-keygen -f "/home/bc/.ssh/known_hosts" -R jps.bonc.local RSA host key for jps.bonc.local has changed and you have requested strict checking. Host key verification failed.
解决问题：
细心的人看给的提示信息就能解决问题^_^
公钥过期
1.ssh-keygen -R 加上你要连接的远程的ip（仔细观察就会发现提示信息中就有）
2.可以去 用户目录下的.ssh目录（笔者的/home/bc/）下找known_hosts对应的RSA key删除。