Why is ssh logon to linux Server slow?

In linux, ssh 1.2.3.4 is slow to log on to linux. It takes a long time to display the entered password. The reason is that the sshd process will reverse resolve the domain name based on the ip address, resolve the ip address based on the domain name before logging on. If the ip address is slow to the corresponding domain name, the solution is to disable domain name resolution. Find the sshd configuration file and modify the configuration item "GSSAPIAuthentication ", set it to no. For details, see [html] [root @ sven ~]. # Cat/etc/ssh/sshd_config | grep GSSAPIAuthentication no # GSSAPIAuthentication yes can also be added to the/etc/hosts file "1.2.3.4 sven ", then try ssh again and you will find that the shell is logged on in seconds;