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: