QuickBooks Error 6123 is one of the more frustrating errors users encounter—typically when opening a company file, restoring a backup, or upgrading to a new version. The error message often reads: "Error -6123, 0: Connection to the QuickBooks company file has been lost." But don’t worry—this issue is common and fixable. In this blog, we’ll walk you through the possible causes and solutions. Need immediate assistance? Call 844-753-8012 to speak with a QuickBooks expert now.
What Causes QuickBooks Error 6123?
QuickBooks Error 6123 can be triggered by several different factors, including:
- Corrupted or damaged company file
- Interrupted network connection during file access
- Security software blocking QuickBooks communication
- Restoring a backup file from an external device
- Improper configuration of the .ND (network descriptor) and .TLG (transaction log) files
If you’re not sure which of these is the problem in your case, you can save time by calling 844-753-8012 for expert help.
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Step 1: Use the QuickBooks Tool Hub
The easiest way to resolve Error 6123 is by using the QuickBooks Tool Hub. Download it from the official Intuit website and install it.
- Open the Tool Hub.
- Click Company File Issues.
- Choose Quick Fix my File or File Doctor Tool.
This tool can automatically detect and repair common company file problems. If it doesn't resolve your error, call 844-753-8012 and an expert will guide you through the next steps.
Step 2: Rename the .ND and .TLG Files
The .ND and .TLG files are configuration files QuickBooks uses to access your company file in a multi-user environment. Corruption in these files can lead to Error 6123.
- Locate the folder where your company file is saved.
- Find the files with the same name as your company file but ending in .ND and .TLG.
- Right-click each file and select Rename. Add .old at the end of each filename.
Once renamed, reopen QuickBooks and try accessing your file again. Still stuck? Call 844-753-8012 for hands-on troubleshooting.
Step 3: Move the Company File to a Different Location
Sometimes the folder where your company file is stored is restricted or corrupted.
- Copy your company file (.QBW) to a different location, like your desktop.
- Open QuickBooks and try accessing the file from the new location.
If this works, you’ve found the issue. If not, it might be time to call 844-753-8012 to explore deeper file repair options.
Step 4: Disable Antivirus or Firewall Temporarily
Security software can block QuickBooks from accessing the network or file locations. Temporarily disable your antivirus or firewall, then reopen QuickBooks.
⚠️ Be cautious when doing this, and turn your protection back on after the test.
If you’re unsure how to safely disable or configure your antivirus, it’s best to call 844-753-8012 and let a professional guide you securely.
Step 5: Restore Backup Using Local Storage
If you’re trying to restore a backup from an external device (USB, network, etc.), move the file to your local hard drive first. QuickBooks prefers restoring backups from your computer’s internal storage.
For best results—and to avoid data corruption—contact 844-753-8012 before attempting large backup restorations on your own.
Final Thoughts: Don’t Let Error 6123 Disrupt Your Business
QuickBooks Error 6123 may seem intimidating, but it’s usually the result of a fixable issue. By using the Tool Hub, renaming support files, checking security software, or adjusting file location, most users can resolve the problem quickly. If you’re pressed for time or prefer expert support, call 844-753-8012 and a QuickBooks specialist will get you back up and running without the guesswork.