"An unknown error has occurred" when logging in to App Store

Hi.
I have a valid Apple ID and I have been running Mountain Lion from the day it was released. Starting today I can no longer log in to the App Store. I get "An unknown error has occurred".
I have done the usual bits: checking ermissions, trashing preferences and the cache file, but to no avail.
Any tips would be appreciated.
all best,
tench

Sorry,
you don't need any app Store. That - sorry - bullshi. is mother of all problems.
There is the usuall Software Update process - all can find in finder menue below the apple logo. So why I have to update my iLife and iWork via App Store? Can't this be done by Software update as before? No, we need something special and we also deny any other possible way, like download from apple support page and install manually. No, everybody needs App Store - and then we get an issue after software update and don't get a fix? Sorry, that what I dislike most - a bad customer support.
So, no one needs App Store for a Fix - all apple has to do is simply provide a simple MacUpdate via Software Update process and all is fine again.
And Software Update is just in such cases the best choice and most possible way to fix such problems - and we need also a valid and good second way - if all strings get cut...
We need ways without any strong internet - because I know places, were you cannot download a MacOS

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Sorry,
you don't need any app Store. That - sorry - bullshi. is mother of all problems.
There is the usuall Software Update process - all can find in finder menue below the apple logo. So why I have to update my iLife and iWork via App Store? Can't this be done by Software update as before? No, we need something special and we also deny any other possible way, like download from apple support page and install manually. No, everybody needs App Store - and then we get an issue after software update and don't get a fix? Sorry, that what I dislike most - a bad customer support.
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We need ways without any strong internet - because I know places, were you cannot download a MacOS

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