What is Telnet?

The Telnet protocol is

Use one:

Test port number

Example: Test if the 80 port on this machine is open

1. Get the native IP

DOS command: ipconfig

Can see the IP address of the machine is 192.168.0.102, of course, this is also LAN IP, not public IP, but does not affect the test

2. View the ports that are open on this computer

DOS command: Netstat-an

Through the interface can see 135 port is open, of course 80 2869 and so many ports are open, here is 135 as an example

3. Use Telnet to test whether the port of the machine is open

DOS command: Telnet IP port->telnet 192.168.0.102 135

If the port does not pass the prompt: Connecting to IP ... Unable to open the connection to the host port: Connection failed, as shown below

If this port is open, you can go to the black window, as shown below

Use two:

Telnet

Time relationship, time to mend .....

What is Telnet?