How to fix if iTunes and AppStore not working

iTunes and App Store may not work after upgrade to the new MacOS Sierra. You may face “Cannot connect” or “Cannot connect to the App Store. An internet connection is required”,… How to fix?

The following solutions will fix if iTunes and Apple store is not working in MacOS Sierra

  1. Correct Time Zone: System Preferences > Date & Time > Make sure “Set date and time automatically:” is checked [If you are living in North America, you must choose “Apple Americas/U.S. (time.apple.com)”]. And then make the date and time correct.
  2. Fix Invalid or incorrect Certificates: From Finder window > Choose “Go to Folder” from the top menu > Enter “/var/db/crls/” in the Go window > Click on “Go” button > delete completely the following files: crlcache.db and ocspcache.db

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