Hi Tom,
If you've gotten that far, presumably you've set up a pulse.properties file already?
You may need to set java.rmi.server.hostname=<ip-address> on the server running the manager, to the IP address of that system - at least the IP address to which the client (webapp) would connect.
Depending on how your particular network is setup, the RMI server may export it's address incorrectly which would result in something like you're seeing.
--Jens