Asynchronous Calls in ASP.NET 2005 on Windows 2003 SP1

[Kamesh]

Hi,
We have developed a webservice in VS2005 on Windows 2003 SP1 Operating
System. The webservice makes asynchronous calls.
The problem is when we invoke the webservice from a ASP.NET application
the asynchronous calls are not invoked and get a null output. The same
webservice is working fine on Windows2000 and Windows XP Professional. If I
trace the application on Win2003 it generates output some times. Windows 2003
being my client Server I definetly need to be able to generate the output on
this. Any help would be greateful.

Regards,

Kamesh Bora