SBS 2008 HTTPS Browsing and Port Problems

Greetings,

Hopefully someone out there can shed a little light on my SBS 2008 R2 dilema.

Firstly,  I have upgraded from a SBS 2003 setup, clean install.  Everything seems to work fine for a few days, then I start getting a system error (Network Health Event ID 119 "An internet Port mapping is missing".)  I try to fix it with the fix my network wizard, but the it does not correct the problem (even though the wizard says it does).  I am presently using a Linksys WRT600N, ports 25, 80, 443, 987, and 1723 mapped to the server IP, UPnP enabled.  I just can't seem to figure out how to tell which port mapping is missing according to the server.  I've checked to see if the ports were open via the internet, and all the neccesary ports are.

When all this is happening, both the client computers and server computer has lot of difficulty accessing the internet, particularily secure sites, and browsing is SLOW.  As well, some programs cannot access the internet, saying that there is a no connection, or a firewall is preventing access.  I have disabled both firewalls on the server and the client, and the issue still occurs.  I can shut the server down, and enable the DCHP on the router, and the problem with accessing the internet or firewall errors is gone, and everything is back to normal - which leads me to believe there is something I am not setting up correctly on the server.  I have not tweaked anything, basically just a clean install.

I am on satellite internet (hughes) with a HN7000S.  The only thing that kind of helps is setting up a proxy server (192.168.0.1:87(HTTP) and 69.19.14.10:3128(HTTPS)), but that doesn't always work.  None of this ever was an issue with SBS 2003.

Any help would be greatly appreciated.

Stephen Stecyk