Port 445 is a port with mixed reputation. Together with 139 port, it is the main channel for IPC$ intrusion. With it, we can easily access all kinds of * * * folders or * * * printers in the local area network, but it is precisely because of it that hackers have an opportunity, they can secretly * * * enjoy your hard disk through this port, and even format your hard disk silently! What we can do is to find ways to prevent hackers from taking advantage of it and plug the 445 port vulnerability.

Use Windows? The port exclusion function of 2000 system will block all packets from port 445, so that the "big villain" can't get close to your host. The following are the specific implementation steps of the method:

Port exclusion

Open the start menu of Windows 2000 system, select the icon "Network and Dial-up Connection" under "Settings", click with the right mouse button, and then click the "Browse" command in the shortcut menu;

Select the "Internet Protocol (TCP/IP)" item, and then click the "Properties" button to open the Internet Protocol (TCP/IP) property setting page; ?

Continue to click the "Advanced" button on this page to open the advanced TCP/IP setting window, select the "Options" tab, select "TCP/IP Filtering" in the "Optional Settings" item on this tab page, and then click the corresponding "Properties" button to open the setting window as shown in figure 1; ?

As port 445 belongs to TCP port, you can select the "Allow Only" item in the settings corresponding to TCP port, activate the "Add" button below, and click this button. In the "Add Filter" window that opens later, all necessary service port numbers will be added, but the unused 445 port numbers will be excluded. After setting, click "Add Filter".