At the same time, press and hold the win+R key, enter cmd in the running window of this machine, enter the dos interface, and enter the command: telnet127.0.0.18080 Note: telnet space address space port number. If prompted,' telnet' is not an internal or external command, nor is it a runnable program or batch file. Description: Port number 127.0.0. 1 8080 is not connected. 4 If the port is normal, enter the telnet page (all black) to prove that the port is available.