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). But before that, you may want to know what TCP port 445 is used for, so is the port 139. Following details how to block port 445 in Windows 7, 10, and XP in easy and simple ways. It is said that the WannaCry virus infect hard drive via TCP port 445 which opened by system during installing, so does to Petya variant virus. Except for helpless waiting for the cure, there are some things we can do to prevent infection and make things better. By now, no effective decrypt methods found. Important files and documents are encrypted and are blackmailed for $300 to $600 value of virtual Bitcoin currency. WannaCry, also known as Wanna Decryptor ransomware has ran amuck on computers all over the world since the afternoon of May 12, 2017.
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