[Zope] Zope Crash!!!

[Aitor Grajal]

  I have now Zope in 9999.

>If you do (like squid), then when you press 'Restart' on the Control Panel
>then something else might grab the port.
>
  Heeeyyyy!!! if I try Restart, Zope no restart

    And the exception is :
 
exceptions.SystemExit

Zope has exited normally.

Traceback (innermost last):
  File /usr/local/dc/Zope-2.2.1-linux2-x86/lib/python/ZPublisher/Publish.py, line 222, in publish_module
  File /usr/local/dc/Zope-2.2.1-linux2-x86/lib/python/ZPublisher/Publish.py, line 187, in publish
  File /usr/local/dc/Zope-2.2.1-linux2-x86/lib/python/ZPublisher/Publish.py, line 171, in publish
  File /usr/local/dc/Zope-2.2.1-linux2-x86/lib/python/ZPublisher/mapply.py, line 160, in mapply
    (Object: manage_shutdown)
  File /usr/local/dc/Zope-2.2.1-linux2-x86/lib/python/ZPublisher/Publish.py, line 112, in call_object
    (Object: manage_shutdown)
  File /usr/local/dc/Zope-2.2.1-linux2-x86/lib/python/App/ApplicationManager.py, line 384, in manage_shutdown
    (Object: Traversable)
SystemExit: 0


>It also could be that the port is lingering and is still in use when Zope
>tries to restart.
>

What is a "port is lingering" ??

Thanks