Attempting to call an external web service from ASP.NET returns 401 - DefaultCredentials empty

Question

Fails:

//Note: webserviceProxy inherits from SoapHttpClientProtocol //App Pool is running as a user with permissions to call the external webservice var webserviceProxy = new webServiceProxy(); webserviceProxy.PreAuthenticate = true; webserviceProxy.UseDefaultCredentials = true; var returnVal = webServiceProxy.DoSomething(); //Fails with 401, webserviceProxy.Credendials shows an empty username, pass, and domain 

Works:

 //This code works, but I want to assign the current app pool credentials to the webservice proxy credentials. UsingDefaultCredentials doesn't work. The username, passoword, and domain are always null. var webserviceProxy = new webServiceProxy(); webserviceProxy.PreAuthenticate = true; webserviceProxy.Credentials = new NetworkCredential("user", "pass", "domain"); var returnVal = webServiceProxy.DoSomething(); //Fails with 401 

How can I make an external webservice call using an ASP.NET application pool identifier? There seems to be no way to convert System.Security.Principal.WindowsIdentity.GetCurrent() into what I can use for this call.

Thanks!

Answer 1

Perhaps this Microsoft support article will help you solve the problem:

You receive error 401.1 when you browse a website that uses integrated authentication and is hosted in IIS 5.1 or later

The bottom line is that Windows will protect itself when the machine name and the fully qualified domain name of the website do not match.

See also:

• http://social.msdn.microsoft.com/Forums/en-US/sharepointdevelopment/thread/a93e5074-a06f-46e2-af82-c743a9ac96b4/
• http://social.msdn.microsoft.com/Forums/en/sharepointdevelopment/thread/ac38e0da-c828-48b8-aa3f-fb22f30ce581