An unknown error has occurred app store

I tried every solution on I could find on this thread and via google... what finally worked for me was heading to the top toolbar, clicking "Store" and then clicking "Sign Out". Then I successfully signed back in!!

Thank you @mycarehealth,

Logging out/logging back into the AppStore worked for me.

🙂

I have done like u. But still i am facing the problem.

q

POSSIBLE SOLUTIONS:

I got the "Cannot connect to App Store" message and absolutely NOTHING worked. I couldn't sign out and in again or even create a new account. I had this happen a few years ago with whichever OS came before Mavericks (I can't remember), but it just happened to me again recently with El Capitan on my 2012 MacBook Pro. If none of the other solutions here have worked for you (i.e., getting rid of the .plist files, changing ethernet settings, etc.), I can offer these suggestions to fix it or at least get it working long enough for you to make your updates and purchases:

1) Back up your computer and reinstall your operating system from the emergency partition.

2) Back up your computer and reinstall your system from a Time Machine backup and reapply your updates. Or,

3) Restart the computer in Safe Mode (Shift-Restart) and run the App Store.

This one should work because it runs your computer from bare bones, with no extra goodies or utilities running in the background. It's configured the way it was when you bought the computer brand new, so the App Store should run like it did right out of the box. If you can't get the App Store to run any other way, Safe Mode almost always works, which should allow you to at the very least run it temporarily to install your updates and make purchases.

There are several steps:

• Open the App Store, go to the Store menu and sign out

• Restart the computer but hold down the Shift key until the Apple symbol comes up and computer starts booting. It may take a little longer to start up.

• Open the App Store. You should still see the "Cannot connect to App Store" error message.

• Go to the Store menu and select "Sign In". This time, instead of an error message, it should offer you the normal sign in dialog box

• Enter your Apple ID username and password

• It might take a few seconds, but your "Featured", "Categories", "Purchased" and "Updates" buttons should now be selectable, not greyed out.

• Click on whichever ones you want and do what you need to do (browse categories, update, make purchases, etc.).

• When you're done, restart the computer in normal mode (i.e., no Shift key)

• Start the App Store again. It should work just fine from now on. But if it doesn't, at least you now have a functioning workaround.

And by the way, NO THANKS TO APPLE FOR HELPING ME FIND THIS FIX!!! If it were possible, I'd sue you to get back all the hours of my life I wasted working this problem. If you're going to force us to use the App Store as our only means to update and make purchases, there's no excuse for allowing this kind of error to go unfixed, especially for this long. I have to say that this is pathetic. You're basically forcing your users to provide their own tech support. I have yet to come here and see an actual solution to this problem offered by Apple tech support. As far as I can see, these forums are where legitimate tech support questions come to die. There are too many people here having the same problem. If you can't give us an App Store that actually works and your tech support people can't solve the problem because of your buggy programming, at the very least, give us an alternative that can keep us working. How about a page where we can enter our Apple ID and password and get links to the OS and all of our purchased applications from the Apple site or from iCloud. Or maybe you could just fix your crappy App Store. This is just disgraceful.

DNS was definitely NOT the issue for me. Entering Google's DNS (8.8.8.8 and 8.8.4.4) made the situation worse, not better.

No way I'm going to reinstall my entire MacOS. App Store is working as is everything else except iCloud. It's an iCloud only bug, not an entire OS bug. This is swatting a fly with a wrecking ball and simply should not be required.

NOTE TO APPLE: this is a clue stick for you. If your silly app is demanding for me to login but I cannot login because I am already logged in, then YOU HAVE A BUG. Please fix it.

Hi, I tried Kansie's solution below: adding two DNS addresses and clearing the cookies and that worked.

Thank you

This fixed the problem for me. Thanks a lot! 🙂

In the Apple Store app go to top menu item> "Store"> log out> then again log in with your account.

I had this problem for a long time but it fixed the issue for me.

Noorul Bhoelai

Thanks so much you just helped solved my problem. God bless you!

Delete com.apple.appstore.plist in user Library/Cookies folder

4

Worked like a charm for me. Thanks!!!!