Cannot connect RDP over VPN !

Hello ,

I can able to connect to RDP through VPN from Win 7/8 computers but not through the Windows 2008 R2 Servers.

I can successfully connect to the VPN network thou from the Windows 2008 R2 (No Anti-virus installed nor Firewall is enabled) but cannot connect to RDP to VPN Servers where as I can do both through Windows 7/8 workstations.

Kindly help me in this.

Thanks.