While trying to build a default iOS project in Visual Studio I got the following error:
Failed to clean build cache on the server.
Also received error like the following:
Server command 'CleanRemoteCache': failed to clean build cache on the server
I found this bug listed in the Xamarin Bugzilla. Reading through the conversation one of the last items the user listed was that he had to sync the date/time of the two machine. Having just finished a project with WCF and encrypted net.tcp connections I am well familiar with problems time differences can cause.
On my local Windows 8 machine I used the ‘echo %LOGONSERVER% to find the name of my AD controller that my machine is using and then setup the MACOS Date/Time settings to sync against the same server. After this my Build and deployments worked without error.