Problem in Calling Web service asynchronously

[Andy]

Hi All,

I am developing a web application which accesses a long running web service.
this web service again calls a third party web service.

We are calling that web service asynchronously using the callback delegate.

It is working fine on my dev m/c but it is not behaving as intended on or QA
server. In Development environment it displayed the message soon after
calling the BeginXXXXXXX method, but on QA server the message is not getting
displayed instantly.

Does any body have idea what may be the cause of this behavior? Or Are there
any reasons that may prevent the Asynchronous behavior of the web service in
QA enviourment.

Thanks in Advance

regards,
Abhay