File sharing on windows

Posted on 2007-07-31
Last Modified: 2010-04-17
what ports are used in windows for file sharing?
Question by:menreeq
    LVL 95

    Accepted Solution

    Ports 137-139 and sometimes 445.

    LVL 4

    Assisted Solution

    If this is pure file sharing in windows it use to be

    SMB over TCP working over NBT netbios over TCP ports 137, 138 (UDP) and 139 (TCP). Microsoft added SMB over TCP/IP and that uses 445

    If the machine has NBT enabled, it listens on UDP ports 137, 138, and on TCP ports 139, 445. If it has NBT disabled, it listens on TCP port 445 only.


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