Network configuration on client machines

Hello everybody,
in our configuration we have openjms server installed on a dedicated 
machine and an Apache+Tomcat combo running the openjms-tunnel webapp. An 
arbitrary number of client machines in different locations can connect 
to the server and communicate with each other through RMI (if inside 
business LAN) or HTTP (from outer world).
Everything goes well with RMI and for machines that run Linux, Mac or 
Windows 2K also with HTTP.
The problems arise when running on  XP machines with HTTP connections 
(both from LAN and WWW). In that case we get "Lost Connection" 
exceptions soon after connecting to the openjms servlet and without any 
apparent reason. This happened with our first solution that polled 
continuosly for messages so we moved to a more efficient solution by 
using asynch "onMessage" but the problem in some cases seems to be even 
worse.
Is there any kind of limit/configuration/feature that has to be set or 
unset in the OS or in the OpenJMS config?
I know it could not be related to strict openjms usage but we experience 
this problem particularly when using openjms and I thought perhaps some 
of you already bounced against this.
Thank you,
M.


-------------------------------------------------------------------------
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share your
opinions on IT & business topics through brief surveys -- and earn cash
http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV