How to Resolve QuickBooks Error 6129

QuickBooks Error 6129 happens when the database connection verification fails, or QuickBooks was looking to access the Company files. The error message will appear as ‘Database Connection verification failure’. As a result, you are unable to Open the Company records. If you are already on the network; however, still the error comes up then it is most probably a ‘network problem’ where it cannot locate the computer/ server that has the file.

Causes of Quickbooks Error 6129

  • The computers running in the multi-user mode have not updated to the latest release.
  • There is a mismatch between the Client domain and Server.
  • Corrupted/Damaged (.ND) Network data file.
  • The Company file upgraded to the QuickBooks Latest Version with a Non-windows admin profile.
  • A third-party Anti-virus is causing the QuickBooks Error 6129.

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Solutions to Fix QuickBooks Error 6129

Solution 1: Rename ‘. ND File’ 


  • Firstly, Open the folder containing the QB company file and locate the.ND file that needs to be opened and the users need to ND file that corresponds to the company file. For e.g.- Companyfilename.qbw.nd.
  • Right-click on the.ND file
  • Select ‘Rename’
  • Add ‘.OLD’ and choose to Example- company file name.qbw.nd.OLD
  • If the company file is used on many computers, then the users will set-up the QB Database Server Manager. However, if QuickBooks is set up only on one Computer then open you can open the company file.

Solution 2: Copy Company File to Another Location  


  • Once a new folder is created, then go to the folder where the company file is stored. Now copy QuickBooks Error Code 6129 (.QBW).
  • Copying the.QBW is important
  • The QBW file must be pasted in the folder that was made.
  • If QuickBooks is used in many computers, then set-up folder permissions. Then add the new folder in QuickBooks Database Server Manager.

How to Setup Folder permissions?

The users can right-click on the folder that has the company file and select Properties. Select ‘Advanced in the security tab.’

Choose QBDataServiceUserXX & choose Edit. Ensure that these settings are in the allowed mode:

  1. Transverse folder/ execute file
  2. List folder/ read data
  3. Read the attributes
  4. Read extended attributes
  5. Generate Files/write data
  6. Make folders/ append data
  7. Write the attributes
  8. Write extended attributes
  9. Read permissions

Steps to modify ‘not properly set up permissions.’  

  • Right-click the folder with ‘ the Company ’
  • Choose Properties and then Select ‘’
  • Press ‘Edit’
  • Choose ‘QBDataserviceUserXX’ & then choose ‘Full ’
  • Press Allow
  • Next, choose ‘’
  • Press OK.

Change Folder Permissions

  • Firstly, press Windows +E
  • Now open File Explorer
  • Go to Folder and select Properties
  • Perform these steps for all the folders on the List. Note: ‘Apply to all folders’ applies as per the QuickBooks version.
  • Select ‘Everyone’ in the security tab. However, if everyone is not in the ‘Group’ or the ‘User name box,’ the users can add and then type everyone.’
  • Press OK
  • Next, choose ‘Full Control’ and press ‘Apply.
  • Press OK
  • However, if QuickBooks is used on only one computer, then you can open the company file.

Solution 3: Restart Computer in the Safe Mode


If you restart the computer the Safe Mode, then this will stop the third-party application to restrict QuickBooks to run. You can also try to disable third-party Anti-virus and security programs temporarily.

Solution 4: Ensure ‘All computers’ in the same domain


If you are using any domain, then contact who has set up the network.


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