title: IIS Binding with windows authentication
body: <p>I have a local website (<a href="http://localhost/testsite" rel="nofollow noreferrer">http://localhost/testsite</a>) with Windows Authentication, that works well.</p>
  
  <p>Now I changed the binding of the site to an URL (<a href="http://testsite.blablabla.biz" rel="nofollow noreferrer">http://testsite.blablabla.biz</a>) with Windows Authentication which leads to an <code>HTTP 401.1 - Unauthorized You do not have permission to view this directory or page using the credentials that you supplied</code> error.</p>
  
  <p>What am I doing wrong? I searched already a lot on google, but nothing really helps. I think it has something to do with domain names or something, but I'm not sure.</p>