@eschwartz: There is currently no way to run the GUI against a server. That is do-able in principle, but requires a lot of work to get right, so it's something for the future. Currently if you want to run the server as a service and the GUI on the same machine, you need to do what I suggested earlier. Create a wrapper script that stops the server before running the GUI and restarts it after quitting. You can have the GUI autostart its embedded server so that the server is down for only a few seconds.
FYI: You should use
http://127.0.0.1 not 0.0.0.0 as the server IP address.
That error is caused by an outdated version of mechanize, you need version 3.3