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After upgrade to MacOS Mojave, I cannot login or connect to App Store.

I am using the latest MacBook Pro 2018 version. After upgrade to MacOS Mojave, I cannot sign out, login App Store or View my account. It always show "Cannot Connect to App Store". I also upgrade my iMac to MacOS Mojave, my iMac does not have this issue.


How can I fix this issue on my 2018 MacBook Pro?


Thank you

MacBook Pro TouchBar and Touch ID, iOS 12

Posted on Sep 24, 2018 7:50 PM

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379 replies

Oct 1, 2018 6:50 AM in response to brianyen0

At this point in time, I think we have tried everything possible except a clean install. So all we can do is wait for Apple to come up with an answer. I for one won't drop this if I don't hear soon. This is my work computer, and in some form it is creating a problem for me. For one, I got into trouble for creating another account. This network I am on is a secure network, and a secure location. So I had to remove the second account. At least I didn't lose my administrator account.

Oct 1, 2018 9:03 AM in response to Exxplora2

Little Snitch (my third party network filter) issued an app update today that correct the problem with the app store invalid code signature. After restarting both my mac and the app store app, my ability to connect to the app store has been restored. I'm a happy camper again!


I hope everyone struggling with a different app store issue than mine find an equally quick fix.

Oct 1, 2018 10:09 AM in response to brianyen0

Reinstalled macOS and have the same

exact issue. I’ve tried all suggestions posted in this forum and have not resolved the issue. It seems like the only option is to do a clean install, restore files from back up and not restore system settings. I think that’s overkill because it seems like a networking configuration issue on the app side that might be resolved by fixing a file or configuration setting.

 needs to address this since it seems like a common bug.

Oct 1, 2018 1:26 PM in response to WPeter W.

I actually still have a second admin account that I had set up and used only during installation of this new iMac last year. I had not used this account since this then.


I could sign into the App Store and install both new software and updates (e.g. XCode 10) without any issues. Going back to the other admin/user account, ... same issue as before. No sign-in possible. At least, I have my updates now. Books is still an issue, though. Cannot get my new book, that I bought on the iPhone (iOS12) this week.

Oct 2, 2018 2:01 AM in response to brianyen0

We had exactly the same problem after we upgraded our 3 iMacs at work- I tried all the solutions mentioned here but nothing fixed the problem. Signing in with another admin account didn't solve anything, tried to delete all the files mentioned in another thread- nothing changed.. We are all connected over ethernet and this morning I disconnected the ethernet and opened up a personal HotsSpot on my iPhone- and now the App Store is back to life..! But as soon as I disconnect the WiFi connection, go back to ethernet and close the App Store- same as before. But at least we found a solution for now. Maybe that will help someone...

Oct 2, 2018 6:36 AM in response to Stefanspk

Stefanspk wrote:


We had exactly the same problem after we upWe are all connected over ethernet and this morning I disconnected the ethernet and opened up a personal HotsSpot on my iPhone- and now the App Store is back to life..!

Tried this immediately just seeing your post - no luck unfortunately. Same behavior with personal hotspot as with ethernet and wifi.

Oct 2, 2018 6:41 AM in response to b33rg33k

b33rg33k wrote:


So this is a network related issue with the App Store and network port configuration. Funny that so many folks can replicate the issue but we have yet to hear from  Support on a quick fix. Does anyone know what ports the App Store uses when it's connects to Apple's servers?

Yes, I've looked at it. The app store mostly uses 443/tcp, but I don't believe that's the issue. In my case there is no actual network connection attempted that I've been able to detect when signin fails.

Like some of the posters a few pages back I suspect an issue with certificates that are causing the SSL connection to fail before a TCP packet is even sent, but have not had any luck figuring out which exactly and where.

Oct 2, 2018 6:44 AM in response to Exxplora2

Exxplora2 wrote:


You might want to check any network filters you have on your wired network. I had a similar problem and was able to determine that my third party network filter (Little Snitch) was not reading the code signature for the app store correctly. A subsequent update to the third party network filter solved my problem.

Tried that here too - unfortunately no luck with with the Little Snitch update nor with disabling LS.

After upgrade to MacOS Mojave, I cannot login or connect to App Store.

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