I normally use a device for all my debugging in Xamarin however I thought I would try the Xamarin Android Player.
After installing and downloading an emulator image I tried starting the emulator however I was present with the following error :-
OpenGL server is unreachable. Please check that Xamarin Android Player is allowed through your firewall on public networks.
As I use McAfee, my firewall settings are handled by McAfee rather than the Windows Firewall. I viewed the Firewall settings for the Xamarin Android Player (AndroidPlayer) under "View firewall and anti-spam settings > Firewall > Internet Connections for Programs", and it was set to use "Designated Ports". Editing this entry and setting Incoming and Outgoing to "Open ports to Work and Home networks" now allows me to use the Xamarin Android Player.