QuickBooks Error 6123 is a common issue that occurs when users try to open a company file in multi-user mode or restore a backup. This error can disrupt business operations by preventing access to crucial financial data. In this guide, we will explore the causes and step-by-step solutions to resolve QuickBooks Error 6123 .

Common Causes of QuickBooks Error 6123

Several factors can trigger this error:

  • Corrupt QuickBooks Company File – A damaged or incomplete company file can cause access issues.

  • Firewall or Security Software Blocking Connection – Security settings may interfere with QuickBooks' ability to access files.

  • Interruption in Network Connection – Unstable or misconfigured network settings can prevent file access.

  • Corrupt Windows User Profile – If the Windows user profile is damaged, QuickBooks may fail to function correctly.

  • Multiple QuickBooks Versions Installed – Having multiple versions of QuickBooks on the same system can lead to conflicts.

Read More:- QuickBooks Balance sheet out of balance

How to Fix QuickBooks Error 6123?

Follow these troubleshooting steps to resolve the error:

1. Use QuickBooks File Doctor

  • Download and install QuickBooks Tool Hub from Intuit's official website.

  • Open QuickBooks Tool Hub and go to Company File Issues .

  • Click on Run QuickBooks File Doctor and select the affected company file.

  • Follow the on-screen instructions and restart QuickBooks.

2. Rename .ND and .TLG Files

  • Open File Explorer and navigate to the folder containing your company file.

  • Locate files with extensions .ND and .TLG (eg, companyfile.qbw.NDand companyfile.qbw.TLG).

  • Right-click each file and select Rename .

  • Add .OLD at the end (eg, companyfile.qbw.ND.OLD).

  • Restart QuickBooks and check if the error is resolved.

3. Disable Security Software Temporarily

  • Open your antivirus or firewall software .

  • Disable it temporarily while attempting to open QuickBooks.

  • If QuickBooks works, add QuickBooks as an exception in your security settings.

  • Re-enable your security software after troubleshooting.

4. Move the Company File to a Different Location

  • Copy the QuickBooks company file ( .QBW) to a different folder (eg, Desktop).

  • Open QuickBooks and click Open or Restore an Existing Company .

  • Select the copied file and check if it opens without error.

Read More:- QuickBooks Multi-user mode not working

5. Create a New Windows User Profile

  • Open Control Panel > User Accounts .

  • Click Manage Another Account > Add a New User .

  • Assign administrator privileges and log in with the new user profile.

  • Open QuickBooks and check if the issue persists.

Preventing QuickBooks Error 6123

To avoid this error in the future:

  • Regularly update QuickBooks to the latest version.

  • Keep firewall and antivirus settings configured to allow QuickBooks access.

  • Perform regular maintenance on your company files to prevent corruption.

  • Maintain stable network connections, especially in multi-user environments.

  • Backup your QuickBooks data regularly to prevent data loss.

Read More :-   quickbooks has stopped working

Conclusion

QuickBooks Error 6123 can prevent access to crucial financial data, but by following these troubleshooting steps, you can quickly resolve the issue and continue using QuickBooks seamlessly. If the problem persists, contacting QuickBooks Support or an IT professional is recommended for further assistance.