I'm responding to myself in the hope it may help others experiencing the
same problem.

I'm not nailed it, but at least I can make the type 4 driver work over a
remote connection for me. I'm not sure I can explain the behavior I've
observed.

I've done two things. I've made sure any InterClient jars are not part
of my classpath and I've changed my connection request to use a
properties argument. I now get a remote connection.

Bill