'no internet connection', but there is. Cannot update anything.

After installing mountain lion my macbook pro works fine except for installing updates in appstore etc. even system updates. connecting to appstore works but when I go to updates get a message that there is no internet connection, but there is!!!!! How to solve this problem. Already re-installed mountain lion, made
no difference. Who can help me? Please!

Hello,
thanks for that interesting hint.
I have no firewall and my date/time is correct -for germany, that is! Could this be the reason why? But should I switch to US western or eastern time?
But anyhow: I succeeded ordering an iPhoto book a year ago with no problem whatsoever. So I don't really think thats the key to my problem. But I give it a try by switching to Cupertino time
Dirk

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