Can't connect to the Appstore or anything else except Chrome.
Ive been having this problem for a while.
I can't connect to the App Store for any updates to my OS or any other apps. Whenever i try to open App Store or try to login, it says 'Cannot Connect to the App Store. And its been a while since my last update.
I've recently bought a new antivirus but i cant activate it either. The error pop up says that I'm not connected to the internet. Same happens when I try to login to Steam.
I've tried everything from flushing my DNS to combing through my certificates on Keychain. No threads on the Apple community is helping either. I've also tried to login to the App Store using another internet connection, other than my router. So it might not be due to the router.
I've almost given up.
MacBook Pro, OS X Yosemite (10.10.5)