JWS buggy when trying to communicate with servlets within the intranet

Hi out there,
I've a quite odd problem. I've written a distributed Java application, communication is stablished via Java serialized objects using http get and post.
This works fine almost from any place. There are 3 possiblities to start my application:
1. start the client bean directly from hard disc. Communication to server is perfect, everything works fine.
2. I call a special html-page from the server which starts my application in a browser as an applet. This is tricky on some platforms, but at least on windows boxes this works fine, too. So the applet is hosted on the same machine as my Java objects are sent to by http. Those objects are received by a servlet installed on the server. We use IBM Websphere, and perhaps that's the bad guy...
3. I start the application using Java Web Start. Again the .jnlp-File is hosted on the same server machine. And this is where the applicaiton hangs: If I'm outside our company's network, again everything works fine, through firewalls etc. But if I launch the application from within our intranet, the application only works "a little bit". It shows odd behaviour. The aplication may run fine if I send about two objects to the server. But it hangs if I try more objects. I can't reproduce the exact amount of objects transferable as that number differs from try to try!
Has anybody any idea what could be wrong there? The server application's logfiles don't show any errors. The error message is that the client (only if started by JWS, and only from the intranet, and only from time to time) can't locate the servlet.
What is the difference if I call the servlet starting the bean locally from my hard disc or if I start it as downloaded bean via Java Web Start?
Some words to our architecture: We use Windows NT 4.0 SP 5. The server is behind one firewall to the outer world and one firewall to the intranet (demilitarized zone). The problems only occur if trying from intranet to DMZ, but only in combination with JWS. As an application or applet the connection works fine!
Perhaps some network specialist has any idea about that? I know it's a little bit complicated, but perhaps somebody sees somthing I missed yet.
Thanks a lot,
Stefan

Ok sorry. Forget about it. This is some very odd behaviour. Normally the application shouldn't run at all.
I had the wrong proxy settings in the Java Web Start engine.
I'm sorry I already posted that message.
Presentation of my software is in about an hour, so please my panic...

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