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Q:

I wrote some additional code for the OnPublishEnd event. In this event I called a method in a webservice. The webservice is running on the same server as Sitecore. The webservice works fine when called by the URL. However, if I publish the site, I get the following error:

A: 

The problem is not with Sitecore but with ASPNET security. Please take a look at this URL: http://blogs.msdn.com/habibh/archive/2005/05/25/421954.html

There are two ways to fix this error.

1. Disable NTLM authentication (see below).
   
2. Use the following code before calling WebService (pay attention to the lines in bold):

   Service1 WS = new Service1();
   WS.PreAuthenticate = false;
   WS.Credentials = System.Net.CredentialCache.DefaultCredentials;
   string helloWord = WS.HelloWorld();
   Log.Info("Calling WebService is Ok: " + helloWord, this);