SolutionĮnsure that the IPv6 address assigned to the 6TO4 Tunnel (as well as the IPv4 address) of the Terminal Server is allowed on the domain controller for the following: While logging into Terminal/Remote Desktop Services (TS/RDS) on Windows Server 2008 R2, both the 'Securing remote connection.' and 'Applying User Settings.' phases take a very long time (45 to 90 seconds in some cases) to complete.
Having spent 5 weeks with Microsoft technicians trying to work this one out, and seeing plenty of unsolved forum posts on this topic, it seemed worth sharing as the final solution was fairly basic. Blog Slow Login to Windows Server 2008 R2 Remote Desktop
