How to Fix CoreServicesUIAgent Won't Close (7 Ways)

Mac application verification pop-up cannot be closed? Maybe the Core Services UI Agent service is stuck! This article provides a variety of solutions to help you get rid of your troubles quickly.

The Mac system verifies each installed application to ensure security. But if the verification dialog cannot be closed, it may be related to the Core Services UI Agent for Mac. This article will introduce several solutions in detail, including restarting the Mac, terminating the Core Services UI Agent process, etc.

What is a Core Services UI Agent?

CoreServicesUIAgent is a backend service that handles application permissions and updates, and manages alerts, notifications, and other tasks. When you download an application from the App Store, Gatekeeper (built-in anti-malware tool) checks to make sure that the application has not been tampered with by malware or has come from an unknown developer. During Gatekeeper analyzing application code signatures, it uses the Core Services UI Agent to display progress. Usually, you won't notice this dialog, as it will pop up quickly and disappear. However, if there is a problem with the service, the verification dialog will be stuck.

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How to solve the Core Services UI Agent issue on Mac with free trial security testing?

You cannot delete the Core Services UI Agent, which is part of Apple's security mechanism to protect your Mac from piracy or malicious application attacks. Therefore, this article will not cover how to delete it, as your Mac needs it to work properly. Instead, we'll cover how to close that annoying Verification dialog.

Forced exit from the application

Sometimes you don't need to close the Core Services UI Agent, because the problem may be on the application you installed. You can try to exit the app and force it if it cannot exit normally. For example, I recently downloaded an app outside of the App Store on my Mac and found that it prevented the verification dialog from closing.

How to force exit the application:

1. Press Option Command Esc .
2. Select the application you want to exit in the Force Exit Application window.
3. Click "Force Exit".

Alternatively, you can use QuitAll. This is a useful tool that allows you to force exit all applications with one click without going through an extra window. You can also customize shutdown requests and automatically exit the application after a specific period of time.

How to force exit the application:

1. Install and open the QuitAll menu located at the top menu bar.
2. Press the Option key to switch "Exit" to "Forced Exit".
3. Click "Forced Exit All".

Then, check the Mac screen. If the application prevents the Verification dialog from closing, the issue is resolved.

Terminate CoreServicesUIAgent using Activity Monitor

If the verification dialog box is still visible after forced exit, try to terminate the Core Services UI Agent service using Activity Monitor. Activity Monitor is a utility tool that displays processes running on your Mac. This usually solves most problems related to the inability to close the Core Services UI Agent. To terminate the Core Services UI Agent, follow these steps.

1. Open the Activity Monitor application.
2. Browse or search for CoreServicesUIAgent.
3. Select CoreServicesUIAgent in the process list.
4. Click the X icon in the upper right corner of the list.
5. Click "Exit" in the pop-up window.

After terminating the Core Services UI Agent, the verification dialog box usually disappears. But if it still exists, the root cause may be elsewhere. If you downloaded iStat Menus, you can check the overall health of your Mac to see if there are issues such as excessive memory usage or overheating.

iStat Menus displays the status of the Mac in real time. Whether it's main processor usage, memory, temperature, or disk activity, you can easily view important metrics to see if your Mac is experiencing any unexpected problems—especially after terminating the Core Services UI Agent.

Open the application with right click

The Verification dialog is not the only annoyance when CoreServicesUIAgent cannot be closed. Because the verification process is paused, you cannot open installed applications as you normally would. Double-clicking the app won't get any response from your Mac.

There is still a workaround to start the application to bypass CoreServicesUIAgent. Here is how it works.

1. Open Finder and click Apps.
2. Right-click the desired application and select Open.
3. After the verification process is complete, you will see another "Open" button.
4. Click "Open" to launch the application.

The application should start after that unless your Mac has other system problems.

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Temporarily close Gatekeeper

If the Mac's Core Services UI Agent still fails to close after closing the process, try closing Gatekeeper. I'm not saying Gatekeeper is the cause of your dilemma. However, if closing the tool temporarily solves the problem, it's worth a try. However, make sure that the app you installed is 100% secure and re-enable Gatekeeper after opening the app. Otherwise, your Mac will not be immune to potentially harmful applications.

Steps to temporarily disable Gatekeeper:

1. Go to Applications > Utilities and open a terminal.
2. Enter the following command: sudo spctl --master-disable and press Enter.
3. Enter your administrator username and password.
4. Press Return to confirm the changes.

After disabling Gatekeeper, the Verification dialog should disappear. However, please note that this is not a permanent solution. Disabling built-in security features for Mac is never a good idea.

Once you have finished downloading the application, re-enable Gatekeeper to ensure safety. Just like closing Gatekeeper, open the terminal, but enter this command: sudo spctl --master-enable . Then, use your administrator credentials to verify.

Tip: To maximize the security performance of your Mac, I recommend using Pareto Security to check if all built-in protections are automatically turned on. If any protection is closed intentionally or unintentionally, the application will issue a warning. For example, if you forget to re-enable GateKeeper, you will see a red X logo next to System Integrity in the app menu, along with GateKeeper in the submenu.

Restart your Mac

If you still cannot delete CoreServicesUIAgent after trying the above method, restart your Mac. I know this method sounds simple, but sometimes it can solve even the weirdest problems. Click the Apple menu icon > Restart and confirm your selection.

Take a break, walk away for a while, and then return to a new Mac with hopeless no problems.

Install using the Installer Tool

Another reason why the Verification dialog appears is that Gatekeeper validates it every time he downloads the application. If the problem persists, try installing the application using CoreServices Installer. CoreServices Installer is a built-in tool that allows you to manually install applications on your Mac from its image files.

Note: This method is only available if the application publisher allows you to download the application package file separately on their website.

Steps to set up an application using the Installer service:

1. Open Finder>Go to>Go to folder.
2. Type the following in the search bar /System/Library/CoreServices/Installer and press Enter.
3. Double-click the Installer application.
4. Browse to the folder containing the application image package.
5. Select the application you want to install and click Open.

Start the application after installation is complete.

However, don't take it lightly after installing the application. Apple has good reason to verify every app you install. Now that you have bypassed automatic checking, I recommend scanning your Mac with CleanMyMac X, a powerful app that can help optimize and protect your Mac. CleanMyMac also has a malware removal tool that you can use to make sure the entire problem is not caused by the malware that Gatekeeper is trying to block.

Reset NVRAM/PRAM and SMC

Another simple trick that might solve various Mac problems, including the Core Services UI Agent, is resetting NVRAM/PRAM and SMC.

NVRAM and PRAM are memory chips that are used to store temporary settings for Mac services. Meanwhile, SMC is the hardware that controls fans, indicators, power management, and other Mac peripherals.

If you are using an Intel series Mac, you can reset NVRAM/PRAM by holding the Command Option PR and holding it for 20 seconds before releasing it. Please check this article for complete instructions on resetting NVRAM/PRAM and SMC.

If you are using an M-series Mac, there is nothing you can do except restart. These newer models no longer have PRAM and SMC. They do come with NVRAM and the machine will automatically restart if something goes wrong.

Now you can close the Core Services UI Agent

If the Verification dialog still exists, the annoyance is just the smallest of your questions. Your Mac will be slower due to persistent Core Services UI Agent issues. However, by finding ways to remove it, you can alleviate your concerns.

Next time you encounter the same problem, use QuitAll to force exit all applications immediately. Other applications I mentioned, iStat Menus is used to monitor the health of the device, Pareto Security is used to check if all security measures on your Mac are working properly, and CleanMyMac X is used to check for malware and worry-free when using your Mac.

You can download these apps from Setapp, as well as dozens of other apps. A free trial of seven days to see if your productivity will improve.

FAQ:

How to force exit from CoreServicesUIAgent?

Go to Finder > Applications > Utilities > Activity Monitor and find CoreServicesUIAgent in the process list. Click the X icon to terminate the process.

Why can't CoreServicesUIAgent shut down on my Mac?

A common reason is that some applications (especially non-App Store applications) may conflict with the Core Services UI Agent service, preventing the verification dialog from closing. Other causes include system failure, macOS outdated, and malware infection.

Why does my Mac verify everything I open?

Your Mac has an anti-malware tool called Gatekeeper built in. It prevents you from installing illegally modified or malicious applications from known or unknown sources.

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