I'm unable to run Google App Engine: no consistent port localhost

I'm attempting to run Google App Engine just to get a hello world app up but have been failing. I'm on Windows 7 and have tried to use the launcher as well as the Cygwin terminal. Having followed many different suggestions from SO forums (Failed to start devlopment server -- BindError: Unable to find a consistent port localhost) and others:

I have edited the localhosts the etc/hosts file to 127.0.0.1; tried moving the google_appengine and dev_appserver.py files so they are visable to the launcher; I've reinstalled the Google App Engine package; and tried editing the .yaml and main.py files but nothing has worked yet.

The launcher will show the yellow error triangle and will log: "google.appengine.tools.devappserver2.wsgi_server.BindError: Unable to find a consistent port localhost"

Thanks.

Source: http://stackoverflow.com/questions/17633881/im-unable-to-run-google-app-engine-no-consistent-port-localhost

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