title: Issues with X11 and remote DISPLAY - when did the world change on me?
body: <p>I'm fairly sure that I am not insane, but I do have memories of using X11 in the past (80's, 90's) and being able to set the display to anyplace I wanted to. Subject, of course, to access controls. </p>
  
  <p>However, when I try it today on a modern O/S (Ubuntu 11.10 desktop,) for the life of me, I can not get it to work with a remote X server.</p>
  
  <p>After a series of attempts, I decided to ensure that it even worked on my own computer. Shockingly, it didn't work locally either.  To wit:</p>
  
  <ul>
  <li>"<strong>xterm</strong>" works</li>
  <li>So do "<strong>xterm -display :0</strong>" and "<strong>xterm -display :0.0</strong>"</li>
  <li>But "<strong>xterm -display my-ip-addr:0</strong>" does not work</li>
  <li>And neither does "<strong>xterm -display 127.0.0.1:0</strong>"</li>
  </ul>
  
  <p>Things I've already tried:</p>
  
  <ul>
  <li>"<em>xhost +</em>," (no flames about that, please) </li>
  <li>Setting "<em>DISPLAY=foo</em>" instead of "<em>-display foo</em>" </li>
  </ul>
  
  <p>I know about ssh port forwarding, but for a number of reasons, that's not the solution I'm looking for.</p>
  
  <p>What am I missing?</p>