Access a Windows Share Through a Firewall

KB ID 0001061 


I needed to access a folder on a server in a clients DMZ the other week, and the thought struck me ‘I have no idea what ports I need to open to accomplish this?’

Access share though a firewall


Bear in ming I’m just talking about the ports that need to be open, you will still need to authenticate to the remote machine with a user-name and password (unless you have the share wide open which I would not advise).

The Ports that need to open FROM the machine you are connecting with TO the machine you are connecting to are;

  • TCP Port 139 NetBIOS SSN NetBIOS Session Service.
  • TCP Port 445 Microsoft DS Directory Share
  • UDP Port 137 NetBIOS Name Service
  • TCP Port 138 NetBIOS Datagram Service


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Author: Migrated

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