![]() In the last column, the status shows it is “LISTENING”. Roll your mouse to the top and you’ll see the IP address of 445. In one or two seconds, the picture will show up. “ netstat –na” command means scan all connected port and showing in numbers. Then type: “ netstat –na” and press Enter. Press Windows + R key combo to start Run box. Surviving WannaCry and Petya: Essential Tips for Staying SafeĪlthough the port 445 is opened by system on Windows in most cases, it is necessary to check it on your host. ![]() How to Close Port 445 in Windows 11, 10, 7.How to Check If Port 445 Is Open or Not.You will lose browsing capabilities to networks past the intranet network as well. In terms of domain host, this will definitely break group policy. If you close port 445, you will not be able to copy any file system data to or from the path where port 445 is closed. you share your hard drives with any one that can access to this port, including deleting, formating, and implant virus and so on. Keep port 445 and port 139 opened will leave the hard disks exposed on this port, i.e. In Windows 2000, Microsoft has created a new transport for SMB over TCP and UDP on port 445, which replaces the older implementation that was over ports 137, 138, 139. They all serve Windows File and Printer Sharing. Port 139 is used for Network Basic Input Output System (NetBIOS) name resolution and port 445 is used for Server Message Blocks (SMB).
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