Assuming you installed SP1 on the windows 2003, make sure you don't enable firewall while enabling RRAS. this link may help,
Microsoft Windows New release Issues
Troubleshooting Windows Server 2003 SP1 issues. Server 2003 SP1 Issues.
Connectivity issues after the installation of MS05-019 or Server 2003 SP1 ...
www.howtonetworking.com/main.htm
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com
"Simon Lampen" <(E-Mail Removed)> wrote in message news

8A3C581-7AC2-4849-985D-(E-Mail Removed)...
Hi,
I am trying to configure a Win2k3 server for Routing and Remote Access,
however when I use the Configure and Enable Action in the RRAS area I get the
'Please stop and disable Windows Firewall and ICS Service' etc.
So with this disabled and stopped I try again and get a 'ICS in current
enabled....please disable ICS and try again'.
So I think maybe I should check any modems and NICs that might have the
'Allow other network users to connect through this computer internet
connection' setting enabled, however on the advanced tab there is only the
Windows Firewall settings and not any of these ICS settings.
Further to my consternation this computer is not an ICS computer anyway as
we have a router/gateway already and use static IP addresses in a different
range from ICS.
Can anyone suggest a way to get past this point of where Win2k3 thinks that
ICS is enabled so that I can continue to configure the Remote Acces server
function.
Cheers
Simon