Can't access Visual Studio project from IP, only http://localhost

If you are using the Visual Studio Development Server (and not IIS,) your server will only bind to localhost. You can not use another IP address to access it. If you must, you can work around this with proxies.

If you are running IIS, make sure that your web server is binding to all addresses (0.0.0.0)

CygWin Solution (no proxy install needed)

ssh USER@OTHER_HOST -R IIS_PORT:localhost:IIS_PORT

replace USER, OTHER_HOST and IIS_PORT. Now you can browse with your OTHER_HOST to the testpage on localhost:IIS_PORT. This enables you the ability to test your stuff on remote Linux hosts (for example).