There is an annoying error when you try to pair the Visual Studio + Xamarin combo with Mac OS 10.10 Yosemite build host:
The PIN you entered was invalid. Please ensure you have entered the correct PIN
Even though you are entering correct PIN. To fix this, execute on Windows machine:
telnet [ip address of mac host] 5000
If you get an error similar to this:
system_profiler[18700:1303078] Error loading /System/Library/SystemProfiler/SPNVMeReporter.spreporter: Error Domain=NSCocoaErrorDomain Code=4 “The bundle “SPNVMeReporter.spreporter” couldn’t be loaded because its executable couldn’t be located.”
Go to /System/Library/SystemProfiler/ and most likely the SPNVMeReporter.spreporter bundle will have zero size. Delete it (or move it to a safe place) and try pairing again, it should work this time.