[root@pictures_new3 ~]# ssh root@122.122.122.111
The authenticity of host '122.122.122.111 (122.122.122.111)' can't be established.
RSA key fingerprint is cb:8a:f6:0f:13:9c:6c:44:ea:4a:e0:1d:6f:05:a2:ba.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '122.122.122.111' (RSA) to the list of known hosts.
reverse mapping checking getaddrinfo for scdc.worra.com [122.122.122.111] failed - POSSIBLE BREAK-IN ATTEMPT!
Last login: Fri Apr 13 13:37:46 2018 from 58.71.118.58
[root@PI05P01 ~]# 

# 搜索相关资料后，发现只需要如下操作，即可解决问题
[root@PI05P01 ~]# sed -i 's/#   GSSAPIAuthentication no/GSSAPIAuthentication no/' /etc/ssh/ssh_config
[root@PI05P01 ~]# sed -i 's/#   GSSAPIAuthentication no/GSSAPIAuthentication no/' /etc/ssh/sshd_config
[root@PI05P01 ~]# /etc/init.d/sshd restart

# 经验证后，不再报错。