When do the SOAPCLIENT_ERROR errors occur and how do resolve them

[sadhvi]

HI,

I have a funny problem. I have a VC++ client which is consuming a
webservice.
The VC++ client has been developed using VS .Net 2003 IDE.
I simply do an Add web reference to consume a webservice.

Adding a web reference generates an sproxy.exe generated class which
generates the necessary soap requests. This in turn invokes methods in
atlsoap.h and atlhttp.inl such as SendRequest etc.

The problem is that most of the times, when I invoke a webservice
method it throws me a couple of soap errors such as
SOAPCLIENT_PARSEFAULT_ERROR or SOAPCLIENT_READ_ERROR or
SOAPCLIENT_SEND_ERROR. I fail to understand why would such errors
occur. What is going wrong in the HttpReuest that is being sent to the
web service which is generating these errors?
Are there any security issues or is there some bug in .Net framework
1.1??

Can anyone please throw some light on this problem.

Cheers,
Sadhvi