Fix: Can’t Close CoreServicesUIAgent Verifying App


GateKeeper is a native macOS security feature that monitors and blocks malware from apps you have installed on your machine. CoreServicesUIAgent is a built-in GUI agent that informs users that the system should check third-party applications to make sure they pose no security threats.

When you install apps outside of the App Store, the system automatically checks them to make sure that they are not injecting malware into your computer. This is why you can sometimes get a “CoreServicesUIAgent verifies the application“Alert. The problem is that the CoreServicesUIAgent window does not always disappear. The only thing users can do is minimize the window.

Fix: I cannot close a CoreServicesUIAgent verification window

Force quit the application

Press and hold the Option + Command + Esc keys to force the problematic application to quit. You can also access Applications, select Utilities, run it Activity monitor and force the application and CoreServicesUIAgent to be closed.MacOS Activity Monitor shutdown process

Activity Monitor is your best friend when it comes to killing pesky apps or processes that refuse to close. You can either skip to the next step or restart your Mac to make sure that all temporary files associated with this problematic application are cleared from the system.

Treat this as a potential malware threat

Prevention is always better than cure, so deal with this stubborn “CoreServicesUIAgent verifies the application”Alert as an indicator of a potential malware trap. After forcing the problematic application to close, run the free Malwarebytes anti-malware tool and the free EtreCheck tool. Check if these two tools detect anything suspicious. If so, let them remove the threats from your Mac.

Update your Mac

If you’re like me, you probably wait a few weeks before installing the latest version of macOS on your machine. Well, this stubborn verification window from CoreServicesUIAgent may indicate that the respective application is invaded by malware.

Make sure you install the latest macOS updates so that you can take advantage of the latest security updates and help your device fight malware effectively.

update macOS

⇒ Note: Only use the solutions below if you are sure that the applications you are trying to run are safe.

Right click on the app and open it

One way to bypass the verification dialog window is to simply right-click on the application and select Open. Your Mac should show a verification progress bar, then the second Open button should be available. Click on Openand check if you can launch the app normally.

You can also uninstall the problematic application that allowed the CoreServicesUIAgent verification window to remain on the screen. Then restart your Mac, download the app again and this time right click on it and select Open.

Allow apps from anywhere

If your Mac can’t identify the developer of the app you’re trying to launch, it will automatically block it. However, if you are 100% sure that the app is safe, you can ask your Mac to allow apps from anywhere. Keep in mind that by doing this, you are essentially giving up the security that Apple has built into the operating system. So, proceed at your own risk.

Apple intentionally removed the option to allow apps downloaded from anywhere to run on your machine. To re-enable the option and enable it on your Mac, follow the steps below.

  1. Launch the terminal and enter the sudo spctl –master-disable order.
  2. Press the Return key, enter your password, and press the Return key again.
  3. Go to System Preferences and select Security and confidentiality.
  4. Click the lock icon to open the settings.
  5. Then go to Allow apps downloaded from and select All over.mac allow apps to be downloaded from anywhere
  6. Lock the changes and relaunch the problematic application.


If the CoreServicesUIAgent verification window does not disappear, it may indicate that your Mac has detected a potentially malicious application. Force quit the problematic application, use Malwarebytes and EtreCheck to scan for malware, and update your Mac.

Are there particular applications that often prevent you from closing the CoreServicesUIAgent window? Join the conversation below and tell us about your experience.


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