Open "Control Panel" and click "System and Security"; Click Windows Firewall; Click "Advanced Settings" on the right; Click "Inbound Rule" and then click "New Rule" on the right; Then click "Port"; Then fill in the open port number; Then click Next directly; By default, click Next; Finally finished. After that, you can use telnet to test whether the port is open. telnet 127 . 0 . 0 . 18086。 If the interface shown below appears, the port has been opened.