title: ReturnUrl issue with asp.net mvc
body: <p>I have to deal with a legacy asp.net mvc app, which is not configured as I am used to. After a normal logout via:</p>
  
  <pre><code>FormsAuthentication.SignOut();
  </code></pre>
  
  <p>and</p>
  
  <pre><code>return RedirectToAction("Index", "Home");
  </code></pre>
  
  <p>the URI contains:</p>
  
  <pre><code>ReturnUrl=%2f
  </code></pre>
  
  <p>This is not usually the case. How can I suppress this?</p>
  
  <p>Alternatively, when I try to access a page that requires authentication/authorization the login page appears but no appropriate ReturnUrl= is generated (i.e. the URI stays as it is). </p>
  
  <p>Is this an IIS issue, which I have read somewhere, or is the asp.net FormsAuthenticationModule not properly configured? Thanks.</p>