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If a BACnet connector was created manually, a string property tag called "bacnetLocalAddress" with the value being the ip:47809 where FIN Stack service is running will help connect to it. Or any other options mentioned for bind address above. Make sure that you disable and re-enable the connector after applying this change, then ping it.

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titlebacnetLocalAddress (bind address)

Applied to bacnetConn to force the connection to bind to a local address. It is useful when the local machine has multiple IP addresses or NICs attached to it, and it is required to direct the BACnet traffic to a specific interface. The format of bacnetLocalAddress looks like IP:PORT, i.e. 10.10.10.5:47808


Note
titleFirewall & Network Interface

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.

Here is an example: