Login Problems to The Mac App Store

I cannot log into the Mac App Store with my apple ID, which works fine on iTunes & this support communities forum.
I get this message " Your device or computer could not be verified. Contact support for assistance. "
How can I resolve this problem please??

Thanks Rob
you may resovled this problem by doing the below
iTunes for Mac reports error -50 when trying to authorize iTunes Store purchases
http://support.apple.com/kb/ts1811
Regards
Fentyway

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