The rFactor 2 servers are currently unavailable due to an issue that is under investigation. We shall keep you updated with more information and news as and when it becomes available. Apologies for any inconvenience that this may cause.
UPDATE 1: The issue has been reported in the Studio 397 forums - see here.
UPDATE 2 [ISSUE FIXED]: Studio 397 has issued an update, and the problem has now been resolved. The servers are once again available.