This article is about QuickBooks error code 6129, 0 and how to fix it. QuickBooks is an accounting software that helps small and medium enterprises manage their payments and billing & payroll. It also offers data storage and processing in the cloud.

This error occurs when users try to create or open a QuickBooks company file. The error is shown as the following:

Error code: -6129, 0: Database connection verification failure

Causes of QuickBooks Error Code 6129, 0

One/more of the following could be causing the error:

  • The network data file (.nd) is damaged
  • Company file was upgraded to a latest version of QuickBooks with a non-Windows admin profile
  • The server and client computers aren’t on the same domain
  • Third-party anti-virus

Step to Resolve QuickBooks Error Code 6129, 0

If a new company file is being created:

Users should first select Leave in the Easy Step Interview window. This will ask them to save the file and they should choose Yes. After a different file name is used, select Save.

NOTE: The file’s location should be changed if changing the file doesn’t help. Solutions 3 and 4 should be tried if the problem recurs.

If company file is being opened or upgraded:

A sample company file should be opened to check if the problem is only related to a specific file. IF the problem occurs in all files, users must start with solution 2.

Users must log in as Windows admin before taking the steps mentioned in this section.

1: Renaming the .ND file

  • First, the folder containing the company file must be opened and then users must locate the .ND file that corresponds to their company file. For example, it could be CompanyFileName.qbw.nd.
  • After right-clicking on the .ND file, choose Rename and then add .OLD and select Enter. For example, it could be CompanyFileName.qbw.nd.OLD.
  • If the company file is being used in many computers, users might have to set up the QuickBooks Database Server Manager.
  • But if QuickBooks is used in only one computer, the company file should now be opened.

2: Copying company file to another location

  • After creating a new folder, users must go the folder where the company file is stored. Now, the QuickBooks Error Code 6129, 0 company file (.QBW) must be copied.
  • It is very important that the .QBW is being copied and not files like .ND and .TLG.
  • The copied .QBW file must be pasted in the folder that was created.
  • If QuickBooks is being used in several computers, users will have to set up folder permissions and then add the new folder in the QuickBooks Database Server Manager.

Setting up folder permissions

Checking that permissions are properly set

Users must right-click on the folder containing the company file and then choose Properties. Then, choose Advanced in the Security tab.

Next, choose QBDataServiceUserXX and then select Edit. Then, it should be checked that these settings are in Allowed mode:

  1. Traverse Folder/Execute File
  2. List Folder/Read Data
  3. Read Attributes
  4. Read Extended Attributes
  5. Create Files/Write Data
  6. Create Folders/Append Data
  7. Write Attributes
  8. Write Extended Attributes
  9. Read Permissions

If permissions aren’t set properly, these steps should be taken:

  • After right-clicking on the folder containing the company file, users must choose Properties and then choose Security, followed by Edit.
  • Next, users must choose QBDataServiceUserXX and then Full Control, followed by Allow. Then, Apply should be chosen, followed by OK.

Changing folder permissions

  • First Windows + E must be pressed, which will open File Explorer. Then, go to the folder and choose Properties.
  • These steps will have to be taken for all folders on the list. But all folders might not apply to every installation, as they point to a particular QuickBooks version. Contact our QuickBooks Error Code 6129, 0 experts for more information.
  • Users must choose Everyone in the Security tab. But if everyone isn’t in the Group Or User Name box, then users must choose Add and type Everyone and then select OK. Next, Full Control should be chosen, followed by Apply and OK.
  • But if QuickBooks is used in only one computer, the company file should now be opened.

3: Restarting computer in Safe Mode

If the computer is restarted in Safe Mode, a third-party application can be stopped from preventing QuickBooks to run. Users can also attempt to disable third-party anti-virus and security programs temporarily. To do so, users should contact the anti-virus manufacturer.

4: Ensuring all computers are in same domain

If a domain is being used, users must contact whoever has set up their network.

If the problem isn’t solved, or more information is needed, users should call the AccountingHub QuickBooks Technical Support Team at this toll-free number +1844-313-4856.