Cannot Access windows 2008 terminal server using a vista client. Note that this vista client computer can connect to terminal services on a Windows Server 2003. Note also that XP clients have no problems accessing the Windows 2008 Terminal Server...as well as accessiing terminal services on a windows server 2003.
Note also that under Terminal Services configuration, Negotioate using network layer security only is off. All configuration options under rdp-tcp have been set to allow "lowest common denominator". Also, all configurations in active directory are correct because access can be made by all xp clients to the windows server 2008 terminal services.
The only problem is that vista clients cannot access Server 2008 terminal services via their RDP.