Open RRAS MMC Snap-in (RRASMgmt.msc), click on Server->Properties->Security
And click on "Allow IPSec customer policy" and enter Preshared key.
-- 
Regards,
Samirj
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quoted from 
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IPSec for Windows
Internet Protocol Security (IPSec) is supported by the Windows 2000, 2003, and XP operating systems and is integrated with the Active Directory service. IPSec policies can be assigned through Group Policy.  Alternatively, if you have ISA 2004 or SBS 2003, you can use ISA to create a site to site IPSec VPN.
Don't send e-mail or reply to me except you need consulting services. Posting on MS newsgroup will benefit all readers and you may get more help.
Bob Lin, MS-MVP, MCSE & CNE
How to Setup Windows, Network, Remote Access on 
http://www.HowToNetworking.com
Networking, Internet, Routing, VPN Troubleshooting on 
http://www.ChicagoTech.net
This posting is provided "AS IS" with no warranties. 
I recommend Brinkster for web hosting! 
Hi,
I am trying to set up a VPN connection between 2003 SBS 
and a D-Link VPN Router. How does I configure the 2003 
server to respond to this with a Pre-Shared Key and 3-
Des / MD5?
Does it exist some small tools to make this easier?
VPN User