I configured my server to run NAT and am able to access the Internet from my server. Experimenting, I went to routing and remote access /server/IP Routing/IGMP/ and selected the local area connection properties. In the General tab I switched to "IGMP router," saved and tried to access the Internet; I could not. I went back and changed the setting back to "IGMP proxy," but I still could not access the Internet. I checked all my DNS and DHCP and all seemed normal. I have two NIC cards one that goes to my ISP and the other that goes to my network. My question is: What setting(s) got changed when I made the switch and then went back that don't allow me to access the Internet, and how can I change then back without having to reinstall my server OS?
If that bit of brilliant advice (forgive the sarcasm) doesn't solve your problem, then you can either spend a few hours understanding in-depth how RRAS works so you can isolate the problem, or you can spend a few minutes uninstalling and re-installing it. Good luck! I wish it were something that were simpler to troubleshoot so I could offer more tangible advice.
This was first published in September 2002