Quick Troubleshooting Guide to Fix QuickBooks Error 6129, 0

Fix QuickBooks Error Code 6129

When QuickBooks attempts to open company files and the database connection verification fails, QuickBooks error code 6129,0 is shown. The company file cannot be opened by a QuickBooks user as a result of the issue. The software is unable to locate the computer or server that hosts the file if there is a network issue in the network it uses.  When creating or opening a company file for QuickBooks Desktop, you can receive the following error message. 

Error code: 6129, 0: Database connection verification failure”. In this article, we'll talk about how to fix QuickBooks issue 6129,0, and its potential causes.


Read Also: How to Fix QuickBooks Error Code 1603?


QuickBooks error code 6129 480x192

Causes of QuickBooks Error 6129,0

There are various factors that could result in QuickBooks error 6129, 0. Some of them are as follows: 

  • The newest QuickBooks version is not being used on all of the PCs configured for multiple users. 

  • due to network-corrupted data files. 

  • due to a domain mismatch between the client and server. 

  • Using a non-Windows Administrator profile, a company file was updated to a new version of QuickBooks Desktop. 

  • A corrupted network data file (.ND)

Points to Take into Account Before Resolving the 6129 Error 

Take the following steps before moving on to the error 6129 QuickBooks troubleshooting solutions: 


  • Install the most recent updates for the QuickBooks Desktop software. 

  • Restart your computer, then sign in to Windows using an admin account. 

  • To see if the issue only affects that particular company file or if the error also occurs with the sample file, try to access a sample company file. 

  • If you get the error with each sample company file, go to step 2 of the troubleshooting steps and skip step 1 of the troubleshooting steps described further in the article. 

  • If the problem keeps coming up, try renaming your company file.

Methods To Fix QuickBooks Error 6129,0

Use the following troubleshooting techniques to fix QuickBooks error code 6129

Method 1: Rename the network data file 

  • Navigate to the installation folder for QuickBooks in Windows File Manager. 

  • Select "Right-click" to open the.ND file. 

  • Choose Rename, then simply type. 

  • The file name should conclude with OLD. 

  • Reopen the company file if necessary. 

Method 2: To fix error 6129, 0 on Windows, relocate your company file to a different location. 

  • Transfer the company file from the installation folder for QuickBooks. 

  • On your desktop, create a new folder. 

  • Insert the company file into the newly formed folder. 

  • Open QuickBooks Desktop, then select the company file in the newly created folder. 

  • If the issue is resolved, it means the company file's folder is damaged, and you must repair the folder to have a long-lasting solution. 

  • If you get the QuickBooks error 6129 0 once more, proceed to another troubleshooting step.

Method 3: Restart Windows in Safe Mode 

  • When the boot screen appears on your computer after restarting, hold down the F8 key on your keyboard consistently. 

  • If the Advanced Boot Options box does not appear, restart your computer and press and hold the F8 key. 

  • Press the down-arrow key to select Safe Mode with Networking and enter once you've reached the Advanced Boot Options window. 

  • Try opening the company file after logging in using the admin account.

Method 4: Using Safe Mode, disable the antivirus 

When the antivirus software interferes with and obstructs the creation of a fresh company file, QuickBooks error code 6129 may appear. The best option in these instances is to disable the antivirus in safe mode. Use the method in the following way: 


  • Restart the computer in safe mode first. 

  • Go to the Desktop screen and select the option to turn off your antivirus software. 

  • After that, make a company file while making sure the system is running normally. 

  • Reboot the computer after that, then open the QuickBooks application and company file. 

  • Check to see if the error still exists or if it has been fixed. If not, consider the next procedure for resolution.

Method 5: Update QuickBooks Desktop 

An outdated version of QuickBooks might result in significant issues, such as QuickBooks error 6129 0. Therefore, updating it to the most recent version is essential for optimal performance. To put this method into practise, consider about the subsequent actions: 



Update QuickBooks Desktop to Latest Image


  • Next, click the Update Now button and then choose Get Updates. 


Update QuickBooks desktop


  • After the download has finished, you must restart the QuickBooks app. 

  • By complying to the terms and conditions and the on-screen instructions, complete the installation of the most recent update. 


Despite using safe mode, if you are still unable to open the company file, the issue is likely the result of another security system, such as an antivirus or anti-malware, that has been installed on Windows. Call us at +1800-615-2347 right away if you need a qualified QuickBooks support team.


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