The QuickBooks programme is a great tool for organising and managing all of your crucial business files. By ensuring that your business files are safe and secure, the software benefits your firm. Numerous QuickBooks errors have been covered in earlier articles.

You can learn more about QuickBooks POS Error 121 in this post, as well as how to fix it. Permission denied error is another name for QuickBooks POS Error 121. This problem typically happens when you neglect to log into QuickBooks as admin. Any software or activity that requires admin rights may also be affected. If you see this error, you are no longer able to carry out all administrative tasks.

There are numerous solutions to this problem, but first let’s get into more detail regarding QuickBooks Error Code 121.

What is QuickBooks Point of Sale Update Error Code 121

You need to sign in to the POS from another system, according to the QuickBooks Error Code 121. The system where the issue is showing no longer allows you to sign in as a system administrator. You will notice this mistake when the following message appears on your screen.

Causes of QuickBooks POS Error 121

When users sign in to QuickBooks Point of Sale using a user account rather than the Administrator account, one of the main causes of QuickBooks POS Error 121 occurs. One crucial point to keep in mind is that you must stop all QuickBooks Point of Sale procedures and services before beginning any of the required actions to fix the problem.

Steps to Fix QuickBooks POS Error Code 121

Make sure that all Point of Sale processes and services have been closed before attempting to resolve QuickBooks POS Error Code 121. Additionally, you must remove the WSActivity.xml file and all the data from the Entitlement Client folder. The instructions that follow can be very challenging to understand. If you’re not up for it, kindly ask the QuickBooks Point of Sale Error Support staff for assistance.

Here’s how you can fix the QuickBooks POS Error Code 121:

Method 1: Close all the POS Processes & Services

  • To start with, open the task manager window.
  • And then choose the required processes.
  • After that, find and close all the processes.
  • Close the Task Manager process
  • And click on the Windows start button
  • Head towards the search bar and then type “services.msc”.
  • Open the folder and search for “QBPOS Database Manager XX”. Here “XX” refers to the QuickBooks version.
  • Close all the services as well as the service windows.

It ought to fix the error code. Follow the other procedures below, though, if the error code is associated with “QuickBooks POS update: Error 121” and persists.

Method 2: Delete all the Required Files

Go ahead and access the hidden Windows folder to accomplish that. The locations may differ depending on the version of Windows you’re using, including Windows 8.1 and 8, Windows XP, Vista, and Windows 7.

For Windows 8 and 8.1

C:\ Program Data\Intuit\Entitlement Client\v8.0

For Windows Vista and Windows 7

C:\Program Data\Intuit\Entitlement Client\v8.0

For Windows XP


Open all the files in the folders mentioned above. Select them and click on delete.

After that, you need to move to the previous location, which is C:\ Program Data\Intuit\QuickBooks Point of Sale XX.0

Now open the INI folder and remove all the WSActivity files.

  • Reopen the Point of Sale again.
  • If there’s any update, download and install it.
  • And follow the provided instructions for the registration process.

Then, shut all open windows before launching QuickBooks to see if the problem is still present. Try using this approach if it’s still there.

Method 3: End All the Point of Sale Processes & Services

Go to the Task Manager window and then hit Processes.

Search and close all the following processes:

1) qbpos.exe
2) QBPOSShell.exe
3) QBPOSDBService.exe

When you have finished terminating every process, leave the Task Manager window and resume the QuickBooks programme. The QuickBooks POS error troubleshooting guide is now complete.