title: Joomla back-end needs two times login? Why?
body: <p>My login problem is reproducable on different Joomla sites.
  I have this for a Joomla version 2.5.9 and 3.2.</p>
  
  <p><em><strong>Backend users need to put my username and password in twice to get logged in.</em></strong></p>
  
  <p>Are some users experiencing the same? Can someone explain this?</p>
  
  <p><strong>First login</strong> at: <a href="http://my-domain.com/administrator/" rel="nofollow">http://my-domain.com/administrator/</a> For some reason, nobody can login here. This page get redirected to the second page:</p>
  
  <p><strong>Second login</strong> at: <a href="http://www.my-domain.com/administrator/" rel="nofollow">http://www.my-domain.com/administrator/</a> <strong><em>Login is possible here.</em></strong></p>
  
  <p><em>So, I need a WWW in the URL.</em> But some users keep going to the other page. Is this Joomla related? Hosting partner related?</p>
  
  <p>On my <strong><em>other website,</em></strong> I have the <strong><em>reverse problem</em></strong>.</p>
  
  <p><em><strong>Login at:</em></strong> <a href="http://www.other-domain.com/administrator/" rel="nofollow">http://www.other-domain.com/administrator/</a> does not work.</p>
  
  <p><em><strong>Login at:</em></strong> <a href="http://other-domain.com/administrator/" rel="nofollow">http://other-domain.com/administrator/</a> is the redirect page and works.</p>
  
  <p>There is one post with a user having the same problem, but I did not find the usefull answers: <a href="http://forum.joomla.org/viewtopic.php?t=558305" rel="nofollow">http://forum.joomla.org/viewtopic.php?t=558305</a></p>
  
  <p><strong>Thanks! Any help or explanation is useful. I realy need this explanation for my customers.</strong></p>