Enter the telnet test port command: telnet IP port or telnet domain name port.
return
If the port is closed or cannot be connected, the link to the host cannot be opened and the link will fail.
When the port is open and the link is successful, enter the telnet page (all black) to prove that the port is available.
Telnet client life common commands:
Open: establish a Telnet connection to the host using openhostname.
Close: use the command close command to close the existing Telnet connection.
Display: Use the display command to view the current settings of the Telnet client.
Send: Use the send command to send a command to the Telnet server. The following commands are supported:
Ao: give up the output command.
Ayt: "Are you there" command.
Sends the current escape character.
Ip: interrupt handling command.
Synchronization: perform Telnet synchronization operation.
Send a signal.
Commands not listed in the above table will be sent to the Telnet server as strings. For example, sendabcd will send the string abcd to the Telnet server, so that the string will appear in the Telnet session window.
give up
Use quit command to exit Telnet client.