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Is it possible to run Windows file sharing exclusively over port 139, and close port 445 on the firewall between clients and server ? If so, any settings need to be changed on clients and or server ?

Up till now our attempts have failed.

Thanks for any input !

KoenH
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1 Answers1

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Port 139 is for NetBIOS, so computers can see each other on the Windows network.

Port 445 is for SMB (Server Message Block), which is where is actually done the shared access to files, printers, serial ports and more.

So the answer is : No, port 445 is the one used for sharing. Port 139 may be closed if you don't need NetBIOS (unlikely).

More info : Difference between NetBIOS and SMB.

harrymc
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