It's a wierd problem. I'm having the same issue on a Dell PowerEdge 2550 with a Gigabit card. The onboard 100MB card can connect to Windows Update site and scan/install no problem. When I use the Gigabit card I get the exact error you described above. Funny thing is that the Gigabit card used to have no problem connecting to the Windows update site.
I'm not sure what the deal is but if I find anything I'll post it back here.
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