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

Thanks so much Checkyorself289!!

Finally, after spending 3 days digging into all forums finally I could successfully login into App Store just following the AppCleaner directions without re-installing the app!!

Important note: i had to follow the procedure twice since first time, after rebooting and opening AppStore, instead of logging in into appstore, I clicked one app update and same problem again....that was when i run again the appcleaner, rebooted, then logged in as first action after opening the AppStore App and worked well!!! So be sure your follow exactly these steps: 1)AppCleaner 2)reboot 3)open AppStore App 4)Log-ing 5) start using!!!

Not sure what is happening with Apple but this is not really acceptable.....

Thanks @Checkyorself289. The AppCleaner solution fixed my problem of the app store not being able to connect when I clicked the "View information" button.

To get apps to start downloading I also had to force quit all of the store processes as outlined in the "Kill the Culprit App Store Processes" section here:

https://www.makeuseof.com/tag/fix-mac-app-store-problems/

MacBook Pro (Retina, 15-inch, Mid 2015) Mojave 10.14.3

Funny enough: after trying to repair it all ways that are described on that thread without any solution, I waited. At some point the problems basically went away by themselves. Not sure, whether s.th. was changed on apple side or (I suppose this was it) a change to the company network was made; perhaps their authentification requires special ports. I simply do not know, but it is weird and extremely annoying that there are no meaningful error messages, or logs.

I also tried everything else (deleting caches folders, trustfile, updates, different internet connection, logging with different account, logging in on guest account) but this one really worked! I first was afraid I would delete something essential and then would have to reinstall everything.

Thanks!

Thank you Checkyorself289. This is the only fix that worked for me. Before the fix, the App Store would show that I am signed in but I could not see my purchased apps and and account information. It had the error "Cannot connect to App Store". I followed your instructions and after reboot, I tried to log in to the App Store but still could not connect. So I signed out and signed back in to the iCloud and reopened the App Store and bam! I can already see my purchased apps and account info!

After trying all the various security fixes without success I tried connecting to my iCloud in the system preferences which then allowed the App Store to log me in. However, I still cannot make any downloads from the App Store so still not resolved :/

You're true MrJingles. I thought everything was working since I saw that I was connected to the Store. But trying to download any update or any new app is still not working :-(

The issue is old and I 've never seen Apple taking so long to fix a so huge bug...

I've tried everything presented as a solution on the web : deleting plist with the Terminal, reinstalling Mojave, changing certificates settings, changing DNS servers, etc, etc.... No result.

This solution worked for me too.

I signed out of iCloud in System Preferences. Kept all the copies in the system when prompted.

Restarted the system and signed in back again in iCloud in System Preferences

I was already signed in to the Mac App Store as it used to be before I was having this issues. However I found the installed apps were not recognised as installed.

Once system was restarted again the App Store correctly recognised the installed apps.

Try this from my post earlier in the thread that has worked for many others.

So, in my situation, I have a brand new MacBook Air Retina Display. It came brand new with Mojave 10.14.2 and at first boot up, I had the issue of not being able to Sign In to the Apple Store, but was able to sign into all other things like iCloud Drive and iTunes. So, my experience was not from an upgrade, but a brand new computer boot up; not sure if that is relevant or not.

I went thru this thread, any many others, and tried all of them to no avail. The deleting certian "com.apple.appstore", folders, messing with the Trust Settings folder, etc. All of them.

What did finally seem to work for me, which by the way is now after I have updated to Mojave 10.14.3 (I thought that might resolve the issue as many of you probably hoped too), was using AppCleaner.

I have version 3.5.

Launch App Cleaner and then drag and drop the "App Store.app" onto the window. If it gives you an error prompt, just open the App Cleaner Preferences and uncheck the box next to "Protect default OS X apps" and then try it again.

Once successful, it will show all of the components associated with the App Store.app.

Select all of them EXCEPT for the App Store.app and the folder /Library/Application Support. For me, they were the first two in the list. Do Not delete those.

After that, I restarted and actually performed an install of Mojave 10.14.3 over my existing one, but I did not erase or delete anything.

When I completed the installation and restarted, I was able to Sign in "FINALLY" to the App Store.

Someone may want to test whether a reinstall is needed after removing the files. I did not try that. I just went straight to the reinstallation. I hope this works for some of you.

Yeah I had the same problem where I couldn't get into the app store and sign in from a fresh new computer, a macbook pro 13 in. I was fiddling with the files but ended up just reinstalling mojave and now I'm able to sign in but still unable to download apps from the store or update existing ones. When I click "view information" under my account it says that it cannot connect to the app store even though other pages load so it's really bizarre.

I really thought your solution would work for me too, but unfortunately no, on multiple MBP Retina 13" that had been wiped and fresh installed with Mojave 10.14.3 for new deployments. And tried all the other solutions suggested in many other locations.

BUT, updating to the v5, and now v6, Betas of 10.14.4 has fixed it (didn't try any earlier betas, sorry, so can't speak for those).

SUCCESS!

Source of the problem was definitely a bug in the app itself, I reckon.

Cheers!

That is what I've heard from other sources as well: this problem stems from an actual issue with Mojave itself or the version of the app store, so I believe the only solution is patience, however inconvenient, for an update.

I had the same problem since last three days, I have gone through several blogs on this nothing worked for me. today after reading a blog, first I have tried login to iTunes and I have logged in and open the App Store it just opened fine and tried to login to App Store finally I am in. it worked fine.

Hope this can help some one.

Thank you.

Still not working. Geez, the apple online chat spend all my afternoon to do those tests, and told me that this is not a issue submitting to dev because "others are not having such issue". See how many folks are here?

Try the following steps, If you haven't tried.

1. Logout from iTunes if logged in.

2. Shutdown your Mac.

3. Power on your Mac, open iTunes and login , once logged in, open App Store and check.

Let me know once you try this.

Thank you.