System.Net.WebException: The underlying connection was closed Error

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Hello,

One of my client reports they are getting "System.Net.WebException:
The underlying connection was closed: The connection was closed
unexpectedly." error suddently from the last week. None of my other
clients and I am unable to reproduce the problem.

I have 4 web services and 2 of the web services seems to be working
fine, they are basically authentication and displaying some
information. The error happens when they try to invoke a time
consuming operation. I already checked the time out and it is set to
120000 so it can not be time out.

Can someone point me to what could be the problems?
Thanks,.

.

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