Some transactions fail under load

I have installed webserver(Sun Java System Web Server 6.1 SP4) on one machine with load balancer plugin and the application server(Sun Java System Application Server 8.1 EE) on another machine. I have created a load balancer configuration and exported it the web server.

The configuration works fine and I am able to access the application through the web server port under low loads. When I am stress test the application some requests start failing once the number of requests exceed 30 per second. The corresponding error in the web server logs is

[01/Dec/2006:11:45:36] info ( 5819): reports: lb.runtime: RNTM3003 : Error servicing the request :

No server to handle.

There is nothing being written in the application logs.

Any help is welcome.

Thanks.

[800 byte] By [pradeep_venkatarman] at [2007-11-26 11:54:04]