Performance problem with HTTP port != 80

Does anybody has an idea what the cause of the above problem might be?

We built a Client based on the Slide WebDAV Client Library.
When running TWS through Apache on port 80 performance is fine.
Strangely, when changing Apache’s port to something different or accessing TWS through Tomcat’s port 4000 the client performance degrades significantly.

I’m very grateful for any idea what the cause might be.


Maybe it has to do with some traffic shaping running on your network. Port 4000 is being used for gaming and p2p networks:

So it might be slowed down intentionally …



Thanks for responding.
Actually we experience the performance degration on ANY port != 80


Believe it or not, the reason was a buggy JDK 1.4.0_01.