I have a .NET 2.0 Windows application that calls a .NET 1.1 web service. Users have an option of adding details of a proxy if required, along with any credentials and this proxy (a System.Net.WebProxy object) will be used when calling methods of the web service.
I've instances where the proxy works for some users and not others (each user does not necessarily share the same proxy details)
What I would like to ask is what are the general approaches one takes to diagnose and analyse the source of the problem specifically for the WebProxy object.
Some of the cases I've evaluated: Proxy server specified wrongly (URI or port) Incorrect credentials
Are there other approaches that I should be testing out?