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

I experienced this problem after a fresh install of Mojave on a MBP (15"/2016).

After running through a lot of troubleshooting tips from this thread nothing helped.

My solution was to log out of iCloud in system preferences, reboot and then log in to iCloud again.

Beforehand (during the fresh install of Mojave) I deactivated iCloud Drive, Stocks app and some other stuff I don't need in the iCloud system preferences. I think this was what caused the problem.

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.

My problem was a corrupt Accounts4.sqlite file in ~/Library/Accounts. The following steps fixed the issue for me:

1. Go to Finder
2. From the menu, click Go -> Go to Folder...
3. Type: ~/Library/Accounts
4. Create a backup folder: Control-Mouse click -> New Folder, name the folder backup
5. Move all Accounts4 files to the backup folder
6. Log out and then log back in
7. Open App Store

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.

Had a same issue and here's what helped to me. Not sure which of these steps was the actual solution, I suspect it was one of the first two:

• remove and re-add any Apple Wallet credit cards from System Preferences -> Settings
• uncheck "Find my mac" in System Preferences > iCloud and check it back
• kill all processes using Activity monitor that start with "store..."
• remove following files/folders (make a backup):

~/Library/Preferences/com.apple.appstore*

~/Library/Cookies/com.apple.appstore.binarycookies

~/Library/Caches/com.apple.apstore*

After that, restart.

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.

Update

Navigating to /var/db/crls and deleting all of the files in there, followed by rebooting my machine, restored the ability to update and install apps in the App Store.

Just revisiting here to confirm that, for our observation of this issue, the macOS 10.14.4 update newly released today does provide the fix.

Cheers.

Thank you tcwan, I have a new MacBook Pro 15" which booted into Mojave 10.14.2 on initial install and had been working fine accessing everything for over a week when suddenly it began reporting unable to connect. I also had an older Mac which I had just updated. In any event your suggestion of changing the network interface worked for me, although it was in reverse. I had been using WiFi when it stopped working, I plugged an ethernet cable into my USB C hub and stopped WiFi and it began working.

Reboot doesn't seem to solve the problem either but plugging via ethernet cable continues to work.

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!

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.

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.

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 :/

I found a solution that worked for me. It took me two steps, and all credit to BocaBoy in this thread: Re: Mojave installation fails: duplicate App Stores, can't sign in with Apple ID (Macbook Pro, Late 2016)

1. Disable System Integrity Protection:
   1. Reboot the computer into restore mode (press command-R during startup)
   2. Select Terminal from the Utilities... menu
   3. Enter csrutil disable and press return
   4. Restart
2. Back up and archive the folder in /Library/Security/Trust Settings before deleting them through Terminal. I'll copy BocaBoy's instructions here for you all:

OK, I just spoke with Apple engineering and they gave me a fix for this. It worked for me and it may work for you. You must know how to use Terminal and access hidden directories with Finder in the root of your drive.

First, make SURE that you've backed up the directory /Library/Security/Trust Settings. Copy it on your Desktop or Downloads directory, or wherever you'll be able to access it.

1. Again, back up the user certificate trust settings files described above. Then, remove them with the following commands, entering your administrator password when prompted:

cd "/Library/Security"

sudo ditto -ck "Trust Settings" TrustSettingsBackup.zip

cd "/Library/Security/Trust Settings"

sudo rm *.plist

2. Attempt to sign into the App Store.

This didn't work for me until I restarted at which point I was able to log in and see all of my accumulated updates. If you're not comfortable working at the system level, DON'T do this. If you are, this may fix your problem. It did for me.

Once you're sure that you've got the App Store working, you can delete the TrustSettingsBackup.zip file as well as the backup of the Trust Settings directory.

3. Reenable System Integrity Protection by repeating step 1 but using the command csrutil enable.

After I modified the Trust Settings directory, I was able to reboot and connect to the App Store and Books Store.

Good luck, everyone!

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.....