title: IE Windows Security dialog appears to block Selenium navigation
body: <p>I am using Selenium in C# on Windows 10. The site under test should challenge with a Windows Security login box in IE, which it does. But the login box appears to block the call.</p>
  
  <pre><code>var home = "https://site.under.test.com/"; 
  driver = new InternetExplorerDriver(AppDomain.CurrentDomain.BaseDirectory);
  
  driver.Url = home;
  driver.Manage().Window.Maximize();
  driver.Navigate().GoToUrl(home + "secure/");
  
  //code to handle login box goes here, never gets executed unless the dialog box 
  //is manually addressed or something times out in GoToURL(), 
  //and then the dialog box doesn't work.
  </code></pre>
  
  <p>The login box appears:
  <a href="https://i.stack.imgur.com/McJ7J.png" rel="nofollow noreferrer">Click here for screenie of the login box</a></p>
  
  <p>But the execution is stalled on the GoToUrl() call:
  <a href="https://i.stack.imgur.com/ZttBd.png" rel="nofollow noreferrer">Click here for screenie of execution</a></p>
  
  <p>Doesn't matter what code I place after this to handle the popup, execution is blocked until something times out inside GoToUrl().</p>
  
  <p>Is this expected behavior? How does one get around it?</p>
  
  <p><strong><em>Clarification: The problem is not how to enter data into the popup. It is about the code execution not advancing to the point where I can enter data into the popup without intervention or timeout.</em></strong></p>
  
  <p><strong><em>This works on Win8.1, but not on Win10</em></strong></p>