How do you test your Rails app in Internet Explorer? Crossover? Parallels? VMWare?
However, I use VirtualBox and Windows 7 and it turned out to work out of the box.
In your PassengerPrefPane just rename one of your applications to begin with “a”, so that it is alphabetically the FIRST entry! You can verify this by listing the contents of this directory:
The first one will be available on “localhost” in your Mac. That should be the application you would like to test in IE.
Now just boot up your Virtualbox with Windows 7 and hit 10.0.2.2 in the IE, and you will see that particular application.