I could really use some help. We encountered a problem with our customer's Cisco 857 router. The port forwarding rules (PAT) are properly set up and VPN, RDP traffic is forwarded to the SBS server but HTTP and HTTPS traffic cannot get there. They would need them for the Exchange web services (OWA, etc.) These services work from inside the office anyway so the SBS server configuration is all right.
I tested HTTP traffic with turned off Windows firewall as well and also tried to direct the traffic to another server on the internal network but no success. I ran the 'show ip nat translation' command in the Cisco Telnet interface and according to it everything should be OK, the HTTP/HTTPS rules have the very same settings as the working VPN and RDP.
Might it be that the router's web management feature is 'covering' the external port 80 and 443? (Would be strange as no web interface can be seen when I try to connect to the router externally.) Any suggestion beyond what I have already tried would be appreciated... Thanks!