It ran on top of NetBT (NetBIOS over TCP/IP, ports 137, 139, and 138/UDP) in Windows NT. In Windows NT/2K/XP, the SMB (Server Message Block) protocol is used for file sharing, among other things. This service is available in Windows, beginning with Windows 2000 and Windows XP. TCP port 445 is used for direct TCP/IP MS Networking access that does not require the use of a NetBIOS layer. Today, here we learn what is the need for port 445 and why we should close it, if not required. The user only requires access to it in very rare circumstances, but the computer is always listening to it. TCP port 445 was mostly used to infect the virus. The WannaCry ransomware halted thousands of computers around the world in the spring of 2017.
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