I believe this happens whenever McAfee is having issues with their GTI environment (or you having connectivity issues to their servers of course). We've been seeing the same things lately too, so I suspect it is on McAfee's end.
We received a few of these errors recently. They were infrequent and stopped by themselves.
Even if you don't have GTI configured you're managers will still communicate with the GTI server for updates.
I've had one of these alerts as recently as 20:36 EST yesterday (07-Apr-2015). It cleared a little over two minutes later, but there still seem to be some issues.