Error starting php debug

script:

<?php

phpinfo();

command:

:Dbg http://localhost/phpinfo.php

Error:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/vim_debug/commands.py", line 19, in debugger_cmd
    return start(*shlex.split(plain))
  File "/usr/local/lib/python2.7/dist-packages/vim_debug/commands.py", line 92, in start
    debugger.start_url(url)
  File "/usr/local/lib/python2.7/dist-packages/vim_debug/new_debugger.py", line 103, in start_url
    return self.start()
  File "/usr/local/lib/python2.7/dist-packages/vim_debug/new_debugger.py", line 130, in start
    if not self.bend.connect():
  File "/usr/local/lib/python2.7/dist-packages/vim_debug/dbgp.py", line 86, in accept
    serv.bind(('', self.options.get('port', 9001)))
  File "/usr/lib/python2.7/socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
socket.error: [Errno 98] Address already in use  

I have xdebug configured to run on port 9001, so I changed dbg.py to use that port. (I don't know if there is a vim configuration variable to change this, but I don't think that this is the problem. I'm running vim 7.4.

Start by reproducing the :Dbg http://localhost/phpinfo.php command with the reported PHP and Xdebug setup, then read vim_debug/commands.py and vim_debug/dbgp.py around the debugger start and socket bind calls. Done means the reported address-in-use failure is understood and the debugger can start with the configured port, with any relevant configuration behavior documented.