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Make sure firewall isn't blocking the specified ports being used. The BACnet stack requires full access to port 47808 on the network interface(s) you run it on.

Also make sure there aren't two applications running bacnet IP on the network (ie FIN Stack and Niagara). If so, you'll need a second network interface card (NIC) to run them simultaneously. 
Tip: To see if this is the case, stop Niagara service and see if Bacnet now works in FIN Stack.