Remote web workplace and sbs 2003 configuration issue

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http://superuser.com – I have a sbs 2003 with remote web workplace and I am trying to access it externally, I can see the initial page but when I click on remote web workplace link the http://externalipaddress/remote page it says, The requested URL was not found on this server. However I know the permissions are fine as I can see the /remote page internally, I have configured the router to open ports for the external ip address and can reach the first page correctly, can someone please suggest what to do next? It looks to me like some kind of https issue i.e. certificate or router issue, but I have installed the c (HowTos)