> but if we connect to the fb 2.1.0 RC2 server on our client's network
> FBEventManager throws the following exception:
>
> org.firebirdsql.jdbc.FBSQLException: GDS Exception. 335544721. Unable
> to complete network request to host "0.0.0.0".

This has something to have with the Firebird configuration - the IP
address is returned by the server, which in this case opens an auxilary
server socket on some interface and port. Check the firebird.conf for
corresponding parameters.

Roman