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WCF Client Behind ISA: HTTP Error 407

Posted By:      Posted Date: September 21, 2010    Points: 0   Category :WCF

I am moving this thread to WCF from .NET Networking and Communication


We have to connect to a 3rd party XML Web Service outside our LAN by adding a WCF Service Reference to a simple console application


When attempting to invoke any of the generated client class methods, we recieve the following error: "The remote server returned an unexpected response: (407) Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy service is denied.  )."

In old style ASMX Web Reference:

TheServiceWse client = new TheServiceWse();

client.Proxy = new System.Net.WebProxy("ISA Server Name", 800);


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