I'm having an issue with the native Windows SBS 2008 firewall. When enabled (Domain, Private and Public) it is blocking domain clients internal access to Companyweb and my VPN tunnel access throught the perimeter hardware firewall to the domain. When disabled, everything works fine. In both cases, clients have access to the internet. I've tried the "Fix My Network" wizard several times, rebooted the server, checked DNS, DHCP, etc. I'm absolutely positive the problem lies within the Windows firewall.
Is there a rule or port that needs to be changed to get things back on track?