Hatsa, both of your problems (the other thread about URL not working) is because of the wrong SME configuration.
If you have WAN Router you only need single LAN card (unless you have advanced network setup, which I doubt) and configure you SME as a server-only.
If you have direct (bridge) access to Internet you WAN and LAN subnets have to be different or no routing will occur on SME.
Can you explain in more details you connection configuration and all the device that you have like modems, routers, switches, servers? Also would be helpful some info on the purpose of the server (web server, Internet connection sharing, file sharing, e-mail server etc...)