How to diagnose IIS fatal communication error problem

Question

I\'ve a a customer using IIS and an application, developed by us, in ASP.NET 1.1. Monday, for 4 times in a row the following error has appeared:

A proces

Answer 1

Had the same issue on IIS 7, had few reports all worked except one report that was very long and it never worked on IIS7 (it was fine on low spec server).

on IIS7 in application pool's Advance Setting I set "Enable 32-Bit Application" to true and all worked nicely