Don't know what to do

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http://forums.androidcentral.com – Hey, so I have a Samsung Galaxy S3, & just recently started having problems. When I try to sign in at the Google play store, I get a message saying 'Can't establish a reliable connection to the server. This could be a temporary problem or your android device may not be provisioned for data services.' At first I thought it was my internet connection but my internet works fine. So because I can't sign in, I can't download any apps or even look at any apps, the play store just doesn't work at all. I also can't sign in to my youtube account on the youtube app. Does anyone know how I can fix th (HowTos)