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JSI Tip 5468. How can I restrict FRS traffic to a specific port?

To restrict FRS traffic to a specific port:

1. Use the Registry Editor to navigate to:


2. Add a RPC TCP/IP Port Assignment Value Name, a REG_DWORD data type, and set the data value to the port, using the Decimal radix.

NOTE: If you set the data value to 0, a dynamic TCP/IP port assignment is used.

NOTE: Make sure that the port is open on your firewall and that any intermediate network devices or software are NOT filtering the port.

See the following Microsoft Knowledge Base articles:

Q321557 - Improvements in the Post-SP2 Release of Ntfrs.exe That Is Packaged with an Updated Ntfs.sys Driver.

Q154596 - HOWTO: Configure RPC Dynamic Port Allocation to Work with Firewall.

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