Start-All Programs-Administrative Tools-Services (or enter service.exe directly when operating) Find telnet and double-click, select the local system account in the login tab, select "Manual" as the startup type in the general tab, and then click the startup below.

On the desktop ... Network Neighborhood ... Performance ... Local Area Connection ... Properties TCP/IP ... Performance ... Advanced ... Select ... Properties will select all ports;

The operations on the router are:

1, sys or conf t enter edit mode;

2. Fill in the port number IP to be opened, and add the mask, such as:192.168.120.10 255.2555.25555555543

The above example is the typical port 443 of IP192.168.120.10 (i.e. https).