When we installed the linux system , we did not close a service, which led to the need to wait for a while to enter the password after entering the username when logging in to SSH. After summarizing the following solutions, this problem can be solved.
Modify the following two places in sshd_config and restart ssh.
# vi /etc/ssh/sshd_config GSSAPIAuthentication no UseDNS no
restart ssh
# systemctl restart sshd
The above can be solved perfectly.
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