7 Methods To Fix QuickBooks Error 6123 0 - Causes, Solution

Are you constantly seeing QuickBooks Error 6123 pop up when opening or restoring your company file? You’re not alone. This error can be frustrating, especially when you're in the middle of important financial tasks. But don’t worry—we've got your back.

In this detailed guide, we’ll uncover what Error 6123 is, why it appears, and how you can resolve it step-by-step. For instant expert help, call +1-866-409-5111 now.

What is QuickBooks Error 6123?

QuickBooks Error 6123, 0 usually shows up with a message saying:

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

This error occurs when:

• You try to open a company file over a network.

• You restore a backup file.

• You upgrade a company file from an older version.

Common Causes of QuickBooks Error 6123

There are several reasons you might be seeing this error. Here are the top culprits:

• Damaged QuickBooks data file

• Network issues when accessing the company file

• Multiple QuickBooks Database Services running

• Firewall or antivirus blocking the connection

• Corrupt Windows profile

• Issues when restoring a backup file from external storage or cloud

How to Fix QuickBooks Error 6123

Here’s a structured troubleshooting plan you can follow to eliminate the error.

Use QuickBooks Tool Hub

QuickBooks Tool Hub is your best friend for fixing many common errors.

Steps:

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

2. Install and open it.

3. Go to the Company File Issues tab.

4. Click on Run Quick Fix my File.

This tool will automatically scan and repair basic file issues.

Rename .ND and .TLG Files

These are configuration files linked with your company file.

Steps:

1. Locate your company file folder.

2. Find files with the same name as your company file but ending in .ND and .TLG.

3. Right-click each file and rename it (e.g., add “.OLD” at the end).

4. Reopen QuickBooks and your company file.

   
   

Restore Backup to a Local Drive

If you’re restoring a backup file from a USB or network:

Steps:

• Copy the backup file to your desktop or local hard drive.

• Restore it from there instead of directly from external storage.

Disable Antivirus & Firewall Temporarily

Sometimes, security software blocks access to your company file.

Steps:

• Turn off your antivirus/firewall temporarily.

• Try opening the company file again.

Don’t forget to re-enable your protection software once done!

Create a New Windows User Profile

A corrupt Windows profile can cause the error.

Steps:

• Create a new user account with admin rights.

• Log in using the new profile.

• Try accessing your QuickBooks company file.

Tips to Prevent QuickBooks Error 6123 in Future

Avoid future headaches by following these best practices:

• Regularly clean up and optimize your company file.

• Avoid restoring backups directly from cloud or USB.

• Keep your antivirus/firewall settings QuickBooks-friendly.

• Update QuickBooks and Windows OS regularly.

• Always backup your data in multiple secure locations.

Final Thoughts

QuickBooks Error 6123 can feel like a roadblock, but with the right approach, you can get past it easily. Whether you’re a small business owner or a finance professional, don’t let this error disrupt your accounting.

If you ever feel stuck, don’t hesitate—call our team at +1-866-409-5111. Our experts will walk you through the solution or fix it for you in no time.