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Error: -6129, 0: Database connection verification failure

When creating or opening a QuickBooks Desktop company file and you encounter

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

one or more of the following may be preventing QuickBooks Desktop from performing the tasks:

  • Third party antivirus
  • Damaged Network Data file (.nd)
  • A company file upgraded to a new version of QuickBooks Desktop using a non-Windows Administrator profile
  • Server and client machines that are not on the same Domain

Before performing the solutions below, we recommend trying out a few things first:

If you are creating a new company file:

  1. On the Easy Step Interview window, select Leave.
  2. You should be prompted to save the file, select Yes.
  3. Enter a different file name, then select Save.Note: If changing the file name doesn't work, try changing the file location. Follow solutions 3 to 4 if the issue persists.

If you are opening or upgrading your company file:

  • Open a sample company to identify if the issue is file specific or not. If the issue is happening to all your company files, start with Solution 2.
  • Log in as a Windows Administrator before following the steps in this section.

Solution 1: Rename the .ND file

  1. Open the folder where your company file is saved.
  2. Look for the corresponding .ND file of your company file.Example: YourCompanyFileName.qbw.nd
  3. Right-click the .ND file, then select Rename.
  4. Add .OLD, then press Enter.Example: YourCompanyFileName.qbw.nd.OLD
  5. If you are using the company file on multiple computers, you may need to set up the QuickBooks Database Server Manager. If you only use QuickBooks Desktop in one computer, open the company file now.

Solution 2: Copy the company file into a different location

  1. Create a new folder
  2. Open the folder location where your company file is saved.
  3. Copy your QuickBooks company file (.QBW).Important: Make sure that you are copying the .QBW file. DO NOT copy other files such as .ND and .TLG
  4. Paste the .QBW file in the new folder.
  5. If you are using QuickBooks in multiple computers, you need to set up folder permissions and add the new folder in QuickBooks Database Server Manager. If you only use QuickBooks Desktop in one computer, open the company file now.

Restarting your computer in Safe Mode should eliminate the possibility of a third party application preventing QuickBooks Desktop from running. You can also try to temporarily disable your third-party antivirus or security programs. Please contact the manufacturer of your program for the steps.

Solution 4: Make sure all computers are on the same domain

Domain is a type of computer network maintained by a computer professional. Please contact the person in charge or responsible for setting up your network if you are using a domain.

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