David,

When tRio starts up, you should see one or more lines starting with "binding rmi:" in the tRio console (not the java plug-in console). What do these read?

If they don't show 192.168.2.1 then try adding host-name="192.168.2.1" to the <rmi> element in trio.xml (after the create-registry="true" bit).

Cheers
Paul