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

I've tried everything, BUT, this suggestion worked.

Thanks. bunch jgoz85

When it comes to the part with the password I am unable to type it, nothing even comes up when I type.... is that how its post to be.

If you're having problems with the App Store you might try this:

1 - sign out of the App Store.

2 - enable the Debug menu in App Store:

• open the Terminal application.

• copy the command below and paste into the Terminal window:

defaults write com.apple.appstore ShowDebugMenu -bool true

followed by Enter or the Return key.

3 - launch App store and select the Debug ➙ Reset Application option:

4 - sign in and try again.

I'm also having this problem. It started when I downloaded the beta of Mojave and persists through the release. If you open Console, you should be able to start to diagnose what is causing the error, although I haven't been able to fix it yet. I have reported it to Apple and hopefully a future update will resolve it.

Here's the code that I've found in Console for my issue. As you can see, there appears to be two different instances of the files that would authenticate my sign in. Unfortunately, they're owned by Root and can't be deleted, changed or renamed. Ironically, the sign in credentials seem to be accepted because if I use the wrong credentials it rejects them. Even with the right sign in, I always see Sign In in the lower left and in the menu, and I'm unable to purchase items or to upgrade existing applications.

Sep 25 07:26:13 Rons-MacbookPro-3 App Store[2783]: DEPRECATED USE in libdispatch client: dispatch source activated with no event handler set; set a breakpoint on _dispatch_bug_deprecated to debug

Sep 25 07:26:21 Rons-MacbookPro-3 App Store[2783]: objc[2783]: Class ITNSImage is implemented in both /System/Library/Frameworks/iTunesLibrary.framework/Versions/A/iTunesLibrary (0x7fff86114568) and /System/Library/CoreServices/SetupAssistantPlugins/iTunes.icdplugin/Contents/Ma cOS/iTunes (0x11f5567c8). One of the two will be used. Which one is undefined.

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.

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?

After you follow the directions in the first part of BocaBoy's post open the terminal located in Applications/Utilities and type or copy and paste each line and press enter after each copy and paste. So you will have copied and pasted three times. Now after the first line is copied and pasted the terminal will ask for your password (the one you use to enter Mac OS) after that it is just copy paste and then when the last line is entered and enter is pressed reboot and all should be working. Below is details.

sudo ditto -ck "Trust Settings" TrustSettingsBackup.zip (Then press enter)

Now enter password

cd "/Library/Security/Trust Settings" (Then press enter)

sudo rm *.plist" (Then Press enter)

Now reboot

Prarrori1, The first line gives you Administrator rights to create a Zip file of Trust Settings, then creates the file. The second command changes the directory (cd) to Library/Security/Trust Settings. The third command gives you Administrator rights to remove any file ending in plist. These are preference files and are regenerated when they are missing. The error appears to be in that file. Apple is asking for it to be deleted so that it can be regenerated with fresh content.

Use Terminal to cut and paste these commands into, one at a time, using Enter after each one. If your password is needed, it will prompt you for it.

Lastly, if you're uncomfortable working at the system level, DON'T DO THIS. Many people in this forum and on this thread are comfortable using Terminal. They also, presumably, have the know-how to recover if they make a mistake. If you're not one of them, I repeat, DON'T DO THIS.

Now that Apple engineering has identified and acknowledged the problem, it will show up in a future release, maybe as early as 10.14.1.

Is that what is in your Security Trust Settings? Now as I said before follow the directions. Only cut and paste. That file is what needs to be copied to a safe place documents or user. But maybe someone else can chime in. Looks like you typed something wrong. That pilst file should be removed with the process. I don't want to tell you to delete it, as I am not sure if it can be done and if it is safe.

I know you've run these commands a few times, so my guess is that you've already deleted the files, even though you thought you weren’t.

Have you restarted and then tried the App Store? The *.plist files will regenerate themselves the first time you log into the App Store.

Thank you for turning me to the right spot. It didn't work for me initially. But I kept trying and I got it to work. It is the certificates under key chain. Plus another thing that is weird was that the certificates appeared to duplicate themselves both under "System Roots" and "Certificates" as I was toggling them from "Never Trust" to "Use System Defaults".

I also saw some expired certificates that had my Apple ID e-mail address that I was tempted to delete, but I decided not to.

So then I clicked on "System" and saw some certificates listed there. When the first few you mentioned didn't work I proceeded on Toggling the following:

Apple Root CA - G2

Apple Root CA - G3

Those didn't appear to do anything really. So I continued doing it to the remaining certificates listed:

com.apple.kerberos.kdc

com.apple.systemdefault

Now this one was set to "Always Trust" when I found it:

DigiCert High Assurance EV Root CA

So I set it to "Never Trust" and then to "Use System Defaults".

Then I opened up the App Store and then instead of being locked out from being able to login and logout, it prompted me for my password for my Apple ID, I entered it and then the problem went away and it started working properly.

So I thank you for your help in pointing me towards the right direction in solving this problem. Others that were still stuck like I was may be able to correct their problem as I have done.

I hope this information can help someone else who has their App Store locked to the point where it won't accept your password, allow you to log out, and gives a "Cannot Connect to the App Store" and that other message "Unexpected error" when you try to put in your password to connect to the App Store.

Thank you,

Gene

I guess when I go into the app it will say update I am so confused now. I hope that is what will happen. Thanks anyway for your help but if I had screen shots it would be easier to do but will just keep it open all day until I log off computer for the night. I guess I have to live with it I would think there are more people with this issue I am surprised no one else is saying thye have a problem and not fix to it.

Thank you all for your help

I have had so much trouble with iTunes lately. I run 3 airports, 1 is my wifi the other 2 run speakers It has worked so well for the past 6 years through iTunes. Great system. Now AirPlay 2 nothing but problems.

I have been working with Apple support for weeks but still problems. I love the setup but when it doesn’t work F...k. Sonos is looking good.

I tried that already you be better off contacting apple direct they had remote access to my computer and saw the mouse moving around and when he was done it worked for me and also fixed the rainbow spinning wheel on Safari as well cause I was getting this issue as well since the update.

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