title: Internet Explorer ignores cookies on some domains (cannot read or set cookies)
body: <p>I have a site, e.g. <code>example.com</code>, where users can set their own subdomains (one user - one subdomain) and upload their own scripts, e.g. <code>http://somedomain.example.com/xyzzy.php</code> would map to <code>/www/somedomain/xyzzy.php</code></p>
  
  <p>Now, on some of those domains, Internet Explorer 7 won't/can't accept cookies. Checked with Fiddler: the server sends Set-Cookie response correctly, yet the cookie never shows up in IE - for JS or Developer Tools. On request, IE7 doesn't send the Cookie header either.</p>
  
  <p>The cookies are set for the user's domain (e.g. <code>somedomain.example.com</code>), path is <code>/</code>, tried different expiration options (past, future, current, "0"), are not HttpOnly, are not secure.</p>
  
  <p>FF, Opera, Safari and Chrome all work without problems.</p>
  
  <p>Why does IE ignore the cookies?</p>