How to Fix CoreServicesUIAgent Won't Close on Mac

Brithny updated on Jul 01, 2024 | Home >Computer Instruction

Have you ever noticed a persistent application called CoreServicesUIAgent running on your Mac? Here are instances when CoreServicesUIAgent won't close as expected, leading to concerns among Mac users. You might have encountered situations where the CoreServicesUIAgent process remains active even after you've closed all applications.

This issue can be frustrating, as it might cause your Mac's performance to slow down and even consume unnecessary system resources. But fear not; we can help you. This article will delve into CoreServicesUIAgent won't close on Mac properly and provide straightforward steps to resolve the issue and optimize Mac's performance.

Workable Solutions Step-by-step Troubleshooting
Fix 1. Force Quit CoreServicesUIAgent In the Finder, launch Activity Monitor from the Applications, and choose View > All Processes...Full steps
Fix 2. Restart Your Mac Click the Apple menu on the top and click the Restart option in the list to check if it's fixed...Full steps
Fix 3. Uninstall Applications in CoreServicesUIAgent Open Finder, click on Applications in the sidebar and locate the application...Full steps
Fix 4. Right Click to Open the Application If you right-click on the program and choose Open, you can avoid the dialogue box...Full steps
Other Practical Fixes Installing applications from the installer, temporarily disabling Gatekeeper, and updating macOS...Full steps

What Is CoreServicesUIAgent on Mac

CoreServicesUIAgent is a crucial component of the macOS operating system, responsible for handling various user interface-related tasks in the background. From managing system alerts and notifications to ensuring the smooth functioning of visual elements like menus and buttons, it plays a pivotal role in providing a seamless user experience.

What Is CoreServicesUIAgent on Mac

This essential agent ensures a smooth and user-friendly experience on your Mac. It handles tasks such as displaying system notifications, managing application windows, and controlling system preferences.

For example, when you receive a new email or a software update notification, CoreServicesUIAgent is responsible for showing these alerts on your screen.

How to Fix CoreServicesUIAgent Won't Close on Mac

After learning about what CoreServicesUIAgent is, you may confused when it suddenly can't be closed or forced to quit not working on Mac. A Mac user posted on the Apple community as follows:

I downloaded an app, and there was nothing wrong with the process. However, now I have two little "Verifying" windows that won't go away. The only option is to minimize them. I'm not sure what to do. From Apple Community

To fix the CoreServicesUIAgent won't close on your Mac, here are 7 effective methods. Take a look:

Fix 1. Force Quit CoreServicesUIAgent via Activity Monitor

If CoreServicesUIAgent becomes unresponsive and refuses to shut down, the Activity Monitor may assist in resolving the problem. You may use Activity Monitor to examine and manage active processes on your Mac.

Use the Control Alt Delete on Mac to force quit CoreServicesUIAgent, and you may be able to remove any problems causing it to hang. Let's show you how to force quit it:

Step 1. In the Finder, launch "Activity Monitor" from the Applications folder.

open Activity Monitor

Step 2. From the top-left menu bar, choose "View > All Processes".

Step 3. In the search box, type CoreServicesUIAgent.

Step 4. Select the app running in the background and press the "x" button.

Step 5. Click the "Force Quit" button. Repeat the procedure with the app that was malfunctioning.

force quit on Mac

Step 6. Return to your desktop to see whether the notice has been removed. If CoreServicesUIAgent "Verifying Microsoft Outlook" persists on your Mac, restart it.

Fix 2. Restart Your Mac

Restarting your Mac is like giving it a fresh start – it clears any confusion or clutter that might be causing the problem. Like turning off and on a gadget to repair a minor issue, restarting your Mac allows it to recover its performance, readjust, and start again.

It's like pushing a reset button, and your Mac wakes up ready to work. That stubborn CoreServicesUIAgent glitch might vanish, allowing you to continue your tasks without interruptions. All you need to do is Choose the Apple menu and click "Restart" to check if it's fixed.

restart Mac

Suppose the "Restart" button not working on your MacBook, don't worry! This article can help you solve this problem.

force restart mac

How to Hard Restart Mac or MacBook [2023 Update]

Forcing a restart of a MacBook, MacBook Air, or MacBook Pro is the quickest way to get everything back up and running. Read more >>

Fix 3. Uninstall Applications in CoreServicesUIAgent Verifying

Certain applications installed on your Mac might conflict with CoreServicesUIAgent, causing it not to close. Uninstalling these applications can potentially resolve the issue. Follow the step-by-step guide below to uninstall:

Step 1. Open Finder and click on "Applications" in the sidebar.

Step 2. Locate the application that you suspect might be causing the problem.

Step 3. Right-click and select "Move to Trash" or drag the application to Trash to remove it.

move to Trash

Step 4. Right-click the Trash icon in the Dock. Select "Empty Trash" to complete the process.

Several users have sometimes expressed frustration at failing to get Mac's trash thoroughly empty. If the Mac Trash won't empty case occurs, this article can help you figure out the possible causes and fix it.

force empty trash mac

How to Force Empty Trash on Mac| 4 Fixes

This article discusses effective ways to force empty Mac Trash. Read more >>

Fix 4. Right Click to Open the Application

If you right-click on the program and choose "Open", you can avoid the dialogue box. After a brief verification process, your Mac will show a second "Open" button. Select "Open" and see whether the program loads correctly.

The program that caused the CoreServicesUIAgent verification window to persist can also be deleted. Restart your Mac, re-download the software, and pick "Open" from the context menu instead of double-clicking.

Share this article on social media to help others learn how to fix the CoreServicesUIAgent won't close on Mac error.


Fix 5. Install Application from Installer

Install the software using the Installer app in /System/Library/CoreServices if the CoreServicesUIAgent verification window prevents it. Use the following steps for your help:

Step 1. Launch "Finder > Go > Go to Folder".

go to folder on Mac

Step 2. Enter /System/Library/CoreServices/Installer after copying and pasting it.

Step 3. Double-click to launch the Installer.

Step 4. If no window appears, choose the Installer icon from the Dock.

Step 5. From the top-left menu bar, choose "File > Open".

Step 6. Choose the.pkg file you wish to install and press the "Open" button.

Fix 6. Temporarily Disable Gatekeeper

To revert to the legacy option that allows you to deactivate Gatekeeper entirely, use Terminal. The Terminal is a macOS command line interface, and it's simple to use if you understand how it works. To deactivate Gatekeeper, do the following steps:

Step 1. Open Terminal by going to "Applications > Utilities".

Step 2. Fill in the blanks using the following command spctl --master-disable sudo.

Step 3. Enter your admin password and press "Enter". Hold and press "Enter" again.

Open anyway option

The Anywhere option should now be accessible in "System Preferences > Security & Privacy > General" under the "Allow applications downloaded from the section".

You can alter the setting to ease or tighten Gatekeeper security anytime from here. However, circumventing any of macOS's built-in security features comes with dangers.

Fix 7. Update Your Mac

Mac users usually let the newest version of macOS a couple of weeks to settle down before installing it on their computer. If the CoreServicesUIAgent verification window refuses to close, it might indicate that the application contains malicious software.

Be careful to apply the most recent updates for macOS in the Mac Software Update so that you may take advantage of the most recent security patches and assist your device in effectively defending itself against malicious software.

Mac software update

Note: While updating your Mac can bring improvements and fixes, it also comes with a tiny risk – the possibility of data loss. Your important documents, cherished photos, and critical files might be affected before updating; back up your crucial files to protect your data. If something goes wrong during the upgrade, this backup protects your data.

🏆Recover Lost Data After Fixing CoreServicesUIAgent Won't Close

While striving to resolve the frustrating CoreServicesUIAgent issue on your Mac, it's wise to anticipate potential data loss situations that may arise during the process.

Sometimes, software updates or system tweaks can unexpectedly lead to the loss of important files, leaving you distressed. But fret not, for there exists a lifeline – EaseUS Data Recovery Wizard for Mac – a powerful and user-friendly tool designed to help you reclaim your lost data.

EaseUS Data Recovery Wizard for Mac is like a digital detective dedicated to locating and restoring files that might have been inadvertently deleted, corrupted, or lost for various reasons.

This software can be crucial to recovering unsaved Word documents, precious family photos, or important project files. Imagine a scenario where you've successfully tackled the CoreServicesUIAgent issue, but in the process, a few files went missing or became inaccessible.

✨Key Features of EaseUS Data Recovery Wizard for Mac

  • Thoroughly scans your Mac to locate and recover various file types.
  • Intuitive design guides users through simple steps.
  • Lets you preview recoverable files before restoring.
  • Supports recovery from various storage devices, such as SD card recovery on Mac.

As you navigate the path of resolving the CoreServicesUIAgent issue, consider EaseUS Data Recovery Wizard for Mac as your safety net, ensuring that even if you encounter data loss after updating, for instance, missing photos after macOS Sonoma updating, your valuable files can be recovered with ease and confidence.

Note: You can create a backup by clicking the "Disk Backup" on the left first. When the disk is damaged or the data on the disk is accidentally deleted or lost, you can get the data back from the backup image.

Step 1. Select the location

Select the disk where you lost data after updating to macOS Sonoma/Ventura/Monterey/Big Sur. Then, click "Search for lost files".

select a location and scan for lost data after macOS update

Step 2. Find lost data after the scan

EaseUS Data Recovery Wizard for Mac will immediately scan your selected disk volume and display the scanning results on the left pane. Use the file type and file path to find wanted data on Mac.

Find lost data after the scan

Step 3. Recover data after macOS update

Select the target files that were unknowingly lost during or after the update and click the "Recover" button to get them all back.

Recover data after macOS update


We hope you've learned about how to fix the "CoreServicesUIAgent won't close" problem on your Mac. You may fix your Mac and return to normal operation by using the advice below. Remember that certain actions, such as upgrading your system and terminating processes abruptly, may improve your overall experience.

The ever-changing nature of technology further emphasizes the need for secure data storage. Consider using EaseUS Data Recovery Wizard for Mac as a thorough backup plan. Because it can restore files deleted for a variety of causes, it gives you peace of mind in the case of sudden data loss.

CoreServicesUIAgent Won't Close FAQs

Here are some questions people frequently ask about CoreServicesUIAgent won't close on Mac:

1. How do I close the core services agent on Mac?

You must launch Activity Monitor on your Mac if you haven't previously. Look for "CoreServicesUIAgent" using the Search tool in the upper right corner. To force CoreServicesUIAgent to terminate, choose "CoreServicesUIAgent" and then click the (X) button.

2. How do you close a program on a Mac that won't close?

Press Option (or Alt), Command, and Esc (Escape) simultaneously. Alternatively, choose Force Quit from the Apple menu in the bottom left corner of your screen.

3. How do I force quit an app that won't force quit?

To force quit an app that won't force quit, it is necessary to press the Option (or Alt) key simultaneously, the Command key, and the Esc (Escape) key. By pressing these keys together, you can execute the desired function seamlessly.

4. How to get rid of verifying Microsoft Outlook pop-ups on Mac?

Sign out and close all Office programs. Delete the OneDrive-related password entries by navigating to Finder > Applications > Utilities > Keychain Access. You can deactivate your license using a tool for license removal. Reboot your Mac, launch Office, and log in again.

Was This Page Helpful?


Updated by Brithny

Brithny is a technology enthusiast, aiming to make readers' tech lives easy and enjoyable. She loves exploring new technologies and writing technical how-to tips. In her spare time, she loves sharing things about her game experience on Facebook or Twitter.

Read full bio

Totalav antivirus software

EaseUS Data Recovery Services

Request a free evaluation >>

EaseUS data recovery experts have uneaqualed expertise to repair disks/systems and salvage data from all devices like RAID, HDD, SSD, USB, etc.