This is because only port 80 or 8080 is opened on the gateway switch or router of the local area network, and other ports are closed, and ports 80 and 8080 are the transmission ports needed for web page access. QQ can be transmitted using TCP and UDP protocols, and many ports are used, including port 80. So as long as you open 80 ports on the gateway, you can meet the online needs of QQ and browsers. If you want other applications, you must enter the gateway and open the port by command, but you need a password to enter the gateway.