SSH login long delay

Sometime in Linux machine, we saw SSH connection take long delay to ask for password. This can easily resolve with some changes in changes in SSH configuration file.

[root@qts ~]# egrep "GSSAPIAuthentication|UseDNS" /etc/ssh/sshd_config

GSSAPIAuthentication no

UseDNS no

Two parameters should configure in above manner
1. GSSAPIAuthentication no
2. UseDNS no

After this we have to restart SSH services. Right now we are working in CentOS7.

systemctl restart sshd.service

             or

Service sshd restart