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Error 6123, 0 in QuickBooks? Here’s How to Fix It

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Henry Parker
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6 min read

QuickBooks is a powerful tool for managing finances, but like any software, it’s prone to occasional errors. One such issue is Error 6123, 0, which often occurs when users attempt to open or restore a company file. This error can disrupt workflows and prevent access to critical financial data.

In this guide, we’ll explore the causes, symptoms, and detailed solutions to resolve QuickBooks Error 6123, 0 effectively.

What is QuickBooks Error 6123, 0?

QuickBooks Error 6123, 0 is a connectivity error that occurs when the software fails to connect to the company file. The error typically displays the message:

“Error 6123, 0: Connection to the QuickBooks company file has been lost.”

This issue commonly arises in scenarios such as:

  • Opening a company file stored on a server or external drive.

  • Restoring a company file from a backup.

  • Upgrading the company file to a newer version of QuickBooks Desktop.

Causes of QuickBooks Error 6123, 0

Several factors can trigger Error 6123, 0:

  1. Corrupted Company File: Damage to the company file can make it inaccessible.

  2. Unstable Network Connection: Weak or interrupted communication between the system and the server can result in this error.

  3. Firewall or Antivirus Blocking Access: Security programs might block QuickBooks from connecting to the file or network.

  4. Multiple Database Services Running: Running multiple instances of QuickBooks Database Server Manager can cause conflicts.

  5. Outdated QuickBooks Software: Using an older version of QuickBooks increases the likelihood of encountering errors.

  6. Corrupt QuickBooks Installation: Improper or incomplete installation of QuickBooks Desktop can lead to operational issues.

Symptoms of Error 6123, 0

Recognizing the signs of Error 6123, 0 helps address it quickly. Key symptoms include:

  • Error message stating “Error 6123, 0” upon opening a company file.

  • QuickBooks crashes when attempting to restore a backup file.

  • Inability to access the company file in multi-user mode.

  • Network issues preventing QuickBooks from connecting to the server.

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Solutions to Resolve QuickBooks Error 6123, 0

Here’s how you can troubleshoot and resolve this error:

Solution 1: Update QuickBooks Desktop

Running an outdated version of QuickBooks often causes compatibility issues. Updating the software can resolve Error 6123, 0.

  1. Open QuickBooks Desktop.

  2. Go to the Help menu and select Update QuickBooks Desktop.

  3. Click on the Update Now tab and select Get Updates.

  4. Restart QuickBooks once the update finishes.

  5. Attempt to open your company file again.

Solution 2: Rename .ND and .TLG Files

The .ND (Network Descriptor) and .TLG (Transaction Log) files are configuration files that help QuickBooks access the company file. Renaming these files can resolve file-related issues.

  1. Navigate to the folder where your company file is saved.

  2. Locate the .ND and .TLG files (e.g., CompanyFile.qbw.ND and CompanyFile.qbw.TLG).

  3. Right-click on each file and select Rename.

  4. Add .OLD to the end of the file name (e.g., CompanyFile.qbw.ND.OLD).

  5. Reopen QuickBooks and try accessing the company file.

Solution 3: Use QuickBooks Tool Hub

The QuickBooks Tool Hub is an official tool from Intuit that can fix common errors, including Error 6123, 0.

  1. Download the latest version of the QuickBooks Tool Hub from the Intuit website.

  2. Install and open the tool.

  3. Click on the Company File Issues tab.

  4. Select Run QuickBooks File Doctor.

  5. Browse and select your company file, then click Check Your File.

  6. Follow the on-screen prompts to complete the repair process.

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Solution 4: Move the Company File to a Local Drive

If the company file is stored on an external device or network drive, moving it to your local system can resolve the issue.

  1. Copy the company file (CompanyFile.qbw) from the external device or server.

  2. Paste it into a folder on your local drive (e.g., C:\QBTemp).

  3. Open QuickBooks Desktop and select Open or Restore a Company File.

  4. Browse to the new location and open the file.

Solution 5: Disable Multi-User Mode on Workstations

If multiple users are accessing the same file, disabling multi-user mode on workstations may resolve the error.

  1. Open QuickBooks on each workstation.

  2. Go to the File menu and select Utilities.

  3. If you see Stop Hosting Multi-User Access, click it.

  4. Ensure that multi-user hosting is active only on the server system.

Solution 6: Check Firewall and Antivirus Settings

Firewalls and antivirus software may block QuickBooks from accessing the necessary resources. Configure your security software to allow QuickBooks operations.

  1. Open your firewall or antivirus application.

  2. Add exceptions for QuickBooks programs (e.g., QBW32.exe, QBDBMgrN.exe).

  3. Ensure the required QuickBooks ports (e.g., 8019, 56728) are open.

  4. Restart your system and check if the issue is resolved.

Solution 7: Create a New Windows User

Corrupted Windows profiles can cause QuickBooks errors. Creating a new user account can bypass this issue.

  1. Press Windows + R to open the Run dialog box.

  2. Type Control Panel and hit Enter.

  3. Go to User Accounts > Manage Another Account > Add a New User.

  4. Create a new user with administrative rights.

  5. Log in with the new account and try accessing the company file.

Solution 8: Reinstall QuickBooks Desktop

If the above solutions don’t work, reinstalling QuickBooks can fix the problem.

Uninstall QuickBooks:

  1. Open the Control Panel and navigate to Programs and Features.

  2. Select QuickBooks Desktop and click Uninstall.

Reinstall QuickBooks:

  1. Download the installation file from the Intuit website.

  2. Follow the on-screen instructions to reinstall QuickBooks.

  3. Activate the software and open your company file.

FAQs About QuickBooks Error 6123, 0

1. What triggers QuickBooks Error 6123, 0?

This error is caused by network issues, file corruption, outdated software, or improper installation.

2. Can I fix this error on my own?

Yes, many fixes, such as renaming files or updating QuickBooks, are user-friendly and don’t require technical expertise.

3. What should I do if the QuickBooks Tool Hub doesn’t resolve the issue?

Try alternative solutions like disabling multi-user mode, checking firewall settings, or reinstalling QuickBooks.

4. How can I avoid this error in the future?

  • Keep QuickBooks updated.

  • Regularly back up your company files.

  • Maintain a stable network connection.

5. Should I contact support if the error persists?

If the error continues after trying all solutions, contact QuickBooks support at +1-855-216-3133 for expert assistance.

Conclusion

QuickBooks Error 6123, 0 can disrupt your accounting tasks, but it is manageable with the right approach. Whether it’s updating your software, renaming configuration files, or utilizing the QuickBooks Tool Hub, these methods should help you regain access to your company file.

For persistent issues, don’t hesitate to seek professional help by calling +1-855-216-3133.