Can't connect to Mac App Store
I have a 2013 Macbook Air, i5/4gb/256 gb. OS X Mountain Lion 10.8.5. I can't connect to iTunes Store or the Mac App Store, they say I'm not connected to the internet. Also on Safari, I can't access Google, it says that it cannot establish a secure connection and cannot connect to server. Although I can access most other websites. I'm can't access the app store or itunes store, so I cannot update anything. I did not modify any settings. I have been using my Macbook for less than a week.
MacBook Air, OS X Mountain Lion (10.8.5)