If you’ve recently updated your Mac to Yosemite, you may be having trouble connecting Visual Studio to the Xamarin Build server.
You know you’re entering the connection pin correctly but you keep seeing the error message…
“The Pin You Entered is Invalid”
Don’t worry, you’re not crazy … It turns out that changes to the network stack in the Yosemite edition of OSX are causing problems in the communication between Xamarin within Visual Studio (running on Windows) and the Xamarin build server (running on OSX).
The Good News: The solution is simple…
Update Yosemite to the latest version, restart Visual Studio and the Xamarin build server and then all should be well.
For more detail on what happened, checkout this discussion of the issue over at Xamarin.