Shulou(Shulou.com)06/02 Report--

Today, upgrade a server's openssh to 7.9p1, and then change the usual two lines in the sshd_config configuration file that allow root to log in with a password. If you restart the sshd service, you will not be able to connect to ssh. Then check all kinds of logs and articles to sum up:

Roll back openssh to the latest version of yum yum remove-y openssh & & yum install-y openssh openssh-clients openssh-server first

Then the public and private keys at the beginning of rm-rf / etc/ssh/ssh_host

Finally, service sshd restart regenerates these and you should be able to restore sshd services.

Execute sshd-T or sshd-t to detect whether the sshd service is configured correctly

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