You mentioned it only happens for a particular combination "windows xp (running in VMware) with IE6". What are other combinations you tried? Did it work on that?
Please try following setting at application server side:
1. Set max-connections under keep-alive to very high value
2. Set timeout-in-seconds under keep-alive to 300
3. Increase acceptor-threads value under http-listener to higher value
Above changes will provide you better performance. However it may not fix the issue.
Have you enabled session replication? Or this behavior is just by fronting application-server with web-server with load-balancer plugin?
If you can provide a sample application to reproduce your issue that will be great.
Thanks,
Kshitiz
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