QuickBooks is a powerful accounting tool, but errors like QuickBooks Error 6123 can disrupt workflow, especially when opening, restoring, or upgrading a company file. The error message typically states: “Error 6123, 0: Connection to the QuickBooks company file has been lost”. In this guide, we’ll explore the reasons behind this issue and provide effective troubleshooting solutions.

What Causes QuickBooks Error 6123?

Several factors can trigger Error 6123 in QuickBooks, including:

1. Corrupt QuickBooks Company File – Damaged files may cause connection failures.

2. Firewall or Security Software Interference – Security settings may block QuickBooks from accessing files.

3. Damaged QuickBooks Installation – If installation files are corrupted, QuickBooks may fail to open files.

4. Multi-User Mode Issues – Misconfigured multi-user mode settings may disrupt file access.

5. Damaged Windows User Profile – A corrupt Windows user profile can prevent access to QuickBooks files.

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How to Fix QuickBooks Error 6123

Follow these step-by-step solutions to fix QuickBooks Error 6123.

Solution 1: Use QuickBooks Tool Hub

1. Download and install QuickBooks Tool Hub from Intuit’s official website.

2. Open QuickBooks Tool Hub and navigate to Company File Issues.

3. Click Quick Fix my File and let the tool run.

4. Restart QuickBooks and check if the issue is resolved.

Solution 2: Rename .ND and .TLG Files

1. Navigate to the QuickBooks company file location.

2. Locate the files with .ND and .TLG extensions (e.g., companyfile.qbw.nd).

3. Right-click each file and select Rename.

4. Add .OLD at the end of each file name (e.g., companyfile.qbw.nd.OLD).

5. Open QuickBooks and check if the issue persists.

Solution 3: Run QuickBooks Database Server Manager

1. Open QuickBooks Tool Hub and go to Network Issues.

2. Click QuickBooks Database Server Manager.

3. Locate your QuickBooks company file folder and scan it.

4. Restart QuickBooks and try accessing the company file.

Solution 4: Move the Company File to a Different Location

1. Copy your QuickBooks company file (.QBW) to a new folder.

2. Open QuickBooks and select Open or Restore an Existing Company.

3. Browse to the new folder location and open the file.

Solution 5: Create a New Windows User Profile

1. Press Windows + I and go to Accounts > Family & Other Users.

2. Click Add someone else to this PC and create a new user with administrator rights.

3. Log in with the new user profile and try opening QuickBooks.

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Preventive Measures to Avoid Error 6123

• Regularly update QuickBooks to the latest version.

• Keep firewall and antivirus settings updated to prevent software conflicts.

• Use QuickBooks File Doctor to repair company files.

• Always backup QuickBooks files to avoid data loss.

• Ensure proper network configuration for multi-user mode.

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Conclusion

QuickBooks Error 6123 can be frustrating, but by following these troubleshooting steps, you can quickly resolve the issue. If the problem persists, consider reaching out to QuickBooks Support for further assistance.