Quickbooks error 6123: Know how to fix them permanently


Are you having problems with QuickBooks Error 6123, 0? When you open a company file or upgrade a business file on a QuickBooks desktop. This issue can also occur if you attempt to resume a backup. Because of this issue, a QB user is often unable to restore the backup.


According to Intuit, the Error code -6123,0 “Connection to the QuickBooks business file has been lost” is most commonly seen in multi-user setups. However, although some alerts may be rectified by simply following the software's instructions, others can be complex and unclear. This error might be caused by a number of factors.

Causes of Quickbooks Error 6123

When a user attempts to restore QuickBooks business data from a backup hard drive or opens a business file from a multi-network server, an error message “QuickBooks Error 6123, 0” appears on the screen. QuickBooks Error Code 6123,0 “Connection to the QuickBooks company file has been lost” arises in multi-user situations for one of the following reasons:


AdvertisementBuild online presence with trusted marketing software (en)
  1. QuickBooks data or application files have been damaged or corrupted.

  2. Your McAfee antivirus has the Block Web Bugs filter enabled.

  3. Your firewall is blocking a port that is required for communication with the server housing the corporate file.

  4. Windows operating system has been corrupted.

  5. The QuickBooks database service is operating in various versions.

  6. The name of your computer system on the machine hosting the QuickBooks business file was altered when the hosting was enabled.

Steps to Fix Quickbooks 6123 Error

You have to follow these methods to rectify these errors. 

Solution #1 – With the Help of QuickBooks File Doctor Tool

  1. Run the QuickBooks File Doctor program after downloading it.

  2. Then, look through the QB Company File.

  3. Select the “Check File Damage Only” option, followed by the “Diagnose File” option.

  4. Enter the Admin Password and then press the "OK" button.

  5. Select 'Open File' in the Newer Version or 'Repair File' in the Existing Version.

  6. Continue with the remaining steps that appear on the screen.

  7. Reboot/restart the computer once you've completed all of the instructions.

  8. Restart the computer once it’s done.

Solution #2: By Renaming .ND and .TLG files

  1. First, Go to the folder containing the company file.

  2. Select your company's associated.ND file.

  3. After that, right-click on the business file and select Rename.

  4. Now, change the.ND file to .ND OLD. Also, select the .TLG file and rename it.

  5. .TLG file should be renamed to.TLG. OLD.

  6. Finally, navigate to your QuickBooks Company File.

Solution #3: Change the Company File Location

If you are still unable to start your QuickBooks business file after attempting the above methods, consider moving it to a different location and restarting it. If you're using a host connection, try copying and opening the file from the computer.

Solution #4: Use Quickbooks Tool Hub

  1. The user must first download the Quick Books tool hub and then use the Quick Fix my Program feature. The steps involved in this case are as follows:

  2. Initially, close QuickBooks.

  3. Then, download the most recent version of the QuickBooks tool hub and save the file somewhere easily accessible.

  4. After that, open the file you downloaded earlier.

  5. Following that, follow the onscreen installation instructions and agree to the licensing agreement to install Quickbooks Tool Hub.

  6. The user must then double-click the tool hub icon on the Windows desktop to access it.

  7. Select program difficulties from the QuickBooks tool hub.

  8. Then pick the fast fix my program option. It may take around a minute to complete. If the user has different versions of QuickBooks.

  9. Then pick the fast fix my program option. It may take around a minute to complete. It may take some time if the user has numerous versions of QuickBooks installed.

  10. When the procedure is finished, open QB and check to see whether the problem has been resolved.

Solution #5: Auto Data Recovery

Restore the ADR file’s copy and test it to see whether it works. There is a chance that the file is corrupt, which may resolve QuickBooks error code 6123, 0. Click on the link for more information about QuickBooks auto data recovery.

Solution #6: Check Antivirus Software

Most of the time, your antivirus application will interact with the company file and label it as malware or virus. As a result, the user may be unable to open its own QuickBooks company file. In that case, you must first close the QuickBooks program before opening the company file. Occasionally, this procedure resolves the trouble number 6123, 0.


Final Note

Hopefully, this tutorial helped you in resolving the issue. It has all the solutions that can be useful to you.