How does the telnet command see that the port can't pass through linux (how to test whether the telnet port can't pass through)
1."The telnet command provides you with graphical information on how to judge whether the port is impassable. Use the telnet command to check whether the port can't pass the required ping to check the server network, enter cmd, then enter the pingip address, enter the telnet command, telnet IP address and port number according to the timeout, and finally open the telnet connection success window.