[root@lxx123 ~]# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      415/sshd
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      452/sendmail: accep
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      408/httpd
tcp6       0      0 :::22                   :::*                    LISTEN      415/sshd
tcp6       0      0 :::8888                 :::*                    LISTEN      659/appnode-ccenter
tcp6       0      0 :::7000                 :::*                    LISTEN      411/frps

只能使用22的ssh