Use the "TCP/IP filter" function to restrict the server ports

You can use the "TCP/IP filter" function to restrict server ports. For individual users, You can restrict all ports because you do not have to allow your machine to provide external services; for external servers that provide network services, we need to open necessary ports (such as WWW port 80, FTP port 21, email service port 25, and 110, all other ports are disabled. In www.2cto.com, if you use Windows 2000 or Windows XP, you do not need to install any other software. You can use the "TCP/IP filter" function to restrict the server ports. The specific settings are as follows: 1. Right-click "Network Neighbor", select "properties", and double-click "Local Connection". (If you are a dial-up Internet user, select the "my connections" icon ), the "local connection status" dialog box is displayed. 2. Click the [properties] button to bring up "Local Connection Properties". Select "Internet Protocol (TCP/IP)" from "Use the following items for this connection )", click [properties. 3. In the pop-up "Internet Protocol (TCP/IP)" dialog box, click the [advanced] button. In the "Advanced TCP/IP Settings" dialog box that appears, select the "options" tab, select "TCP/IP filtering", and click the [properties] button. 4. In the displayed "TCP/IP filtering" dialog box, select the "enable TCP/IP filtering" check box and select "only allow" on the "TCP port" on the left. In this way, you can add or delete your TCP or UDP or IP Ports by yourself. After the machine is added or deleted, your server will be protected after the machine is restarted. Finally, remind individual users not to add any ports if you only browse the Internet. However, some network contact tools, such as OICQ, should be used to open the port "4000". Similarly, if a common network tool cannot work, find out the port opened on your host, and then open the port in "TCP/IP ".