title: I can't "Create or Extend Web Application" in SharePoint?
body: <p>I encounter this error <strong>"Cannot find an unused port"</strong> when I want to <strong>create or extend web application</strong> in Centeral Administration. I also tried to disable the antivirus and firewall but it didn't work.
  The associated error with this in Event viewer is :</p>
  
  <p><em>"The description for Event ID ( 0 ) in Source ( PrmBackgroundAgent ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: system_monitor failed to run."</em></p>
  
  <p>If you have any idea, please let me know it ;)</p>
  
  <p>P.S. I use Moss 2007 with SP2</p>