When I open the App Store on my MAC (macOS High Sierra - version 10.13.6), it says "Cannot Connect to the Store, An internet connection is required".

My internet connection is fine, I browse through all kinds of websites and the dot on Network settings is green.

I've read that this can be fixed signing out and in from the store but when I click on Menu -> Store -> Sign Out, nothing happens. No erros, alerts, nothing.

I've tried quiting the App Store and reopenign, restarting my computer. Nothing changes.

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