Yes that's what I initially thought as well, but I have my game running on a variety of platforms without any problems at all. Every platform can connect to my standalone development server immediately. (I can connect via web browser and regular standalone builds without a problem).
And the reason I think something else might be up is that when you fail to connect to a server on Windows (or any platform for that matter) - you get the error message "Unable to connect". That's it. However on the platform in question, the error is "The object was used after being disposed". So I'm scratching my head
, I'm not quite sure where to start looking.