App Store login results in "An unknown error has occurred"

When I'm trying to login into the app store, I'm always getting the error "An unknown error has occured".
I tried to use a different login and the result is always the same.
I'm able to login into iTunes from the same machine, I'm able to login into this forums and I was able to associate the MacBook into the same apple id.
Why is the App Store the only thing that is not working?
Thanks,
L. Pinho

I solved it (found an entry in another forum).
Delete the NetworkInterfaces.plist file, that's it...
Why? I don't have any idea

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I am unable to log into the mac app store. It says "an unknown error has occurred" i can log onto itunes without any issues. ive read some discussions and tried to delete networkinterfaces.plist but it doesnt even seem to exist, ive looked in 3 different preferences files. I also tried to create a new user id from the mac store and it doesnt even recognize when i click to create user. what can i do next??? Thanks

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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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App Store login results in "An unknown error has occurred"

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