Hey Rolla,

Thanks for your reply!

I am using Forms Authentication, the executable is a VB.Net 2.0 app (i.e managed) and it located in a sub folder of the web application.

The stack trace from the error states that my 'ExecuteProcess' routine is being called but when stepping through in the debugger it never actually gets there, the error is thrown on the function call???

I will investigate the link you have posted.

Matt.