SSH multi-port monitoring or modify the default port 22

1. Modify the configuration file
Modify the configuration file /etc/ssh/sshd_config file
to modify #Port 22 as follows:

Port 22
Port 50000
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2. Restart the sshd service to
restart the sshd service, execute the following command

/etc/init.d/sshd restart　　
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so the SSH port will work at 22 and 50000 at the same time.

Three, firewall configuration
edit /etc/sysconfig/iptables file

Enable port 50000.

Fourth, restart the firewall and
execute /etc/init.d/iptables restart

Note: Restart the service if you encounter: Job for ssh.service failed because the control process exited with error code reported an error, please execute "journalct -xe" to view the exception error