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How LINUX Open 22 Good Ports
Port 22 is an ssh service. You can execute the command "/etc/init.d/sshd start" just by starting the ssh service. Then use netstat-antulp | grepsh to see if you can see the relevant information.

Extended data

Port 22 is an ssh port, and PcAnywhere may establish a connection between TCP and this port to find ssh. This service has many weaknesses. If configured in a specific mode, many versions that use the RSAREF library have many loopholes.

reference data

22 Port _ Baidu Encyclopedia