When setting up MassTransit connections between 2 sites, you can use the following method to verify MassTransit is listening for incoming calls.
From a command prompt type:
C:\>telnet xxx.xxx.xxx.xxx yyyyy
Where xxx.xxx.xxx.xxx is the public IP address
and yyyyy is the port MassTransit should be listening on.
If you get "WATSON!" MassTransit is listening on the IP and port you specified.
The following result means Mass Transit is NOT listening:
"Could not open a connection to host on port 50000 : Connect failed"