How To Recover QuickBooks Error code -6123, 0?

How can you fix your QuickBooks data file or network setup while using your QuickBooks and face this QuickBooks Error 6123, 0 when you opening your company file over a network or multi-user mode, upgrading a company file to a newer version of QuickBooks or you want to restore the backup but you get a 6123,0 error message.

So, simply if you ever face this problem when working with QuickBooks, you can fix this error with QuickBooks File Doctor. But if the file doctor can’t help you to run your system the go to the manual steps given below. But you can also get support from our Intuit Certified QuickBooks Experts to save your time and effort. So, These steps are available for additional troubleshooting.

According to Intuit, QuickBooks Error code -6123,0 “Connection to the QuickBooks company file has been lost” occurs in multi-user environments.

Note: If you are using McAfee security software then this may be the reason behind 6123 errors in QuickBooks Desktop. In this case, as you already know McAfee security software does not belong to intuit so please contact McAfee or read this article for any guidance. If you are not using McAfee then see the steps given below to resolve this issue:

When establishing or when the use of a QuickBooks company report over a network, you see one or more of the following errors:

  • QuickBooks Error -6123, 0.
  • Connection to the QuickBooks company file has been lost.
QuickBooks Error code -6123, 0

Why QuickBooks Error Code 6123, 0 is happening?

  • A corrupt network connection with the host computer.
  • Firewall software is blocking a port necessary to communicate with the server hosting the company file.
  • Damage QBW files.
  • QuickBooks data or program files get corrupt.
  • Multiple instances of QuickBooks database service are running.
  • The McAfee Privacy Service is installed with the Block Web Bugs filter option selected.
  • Maybe the company file is open in a new version of QuickBooks.
  • Maybe you are restoring a backup from a removable storage device.
  • Damaged Window user

Fix QuickBooks Error Error 6123, 0 when upgrading/opening a company file in QuickBooks Desktop

Now let’s discuss its solution. There is some following solution for resolving this error:

  • First of all, you have to download and run the QuickBooks File Doctor in your system.
  • When successfully installed the QuickBooks File Doctor, open it.
  • Check Your company file in the drop-down list, if not there then browse to it.
  • Now mark Check File Damage Only and then select Diagnose File.
  • Enter your admin password, then OK.
  • After that, You will see a popup(message) about upgrading your file to a newer version of QuickBooks. Now choose to Open the file in a newer version, it will repair and upgrade your company file to the latest version of QuickBooks. Or choose to repair the file in the existing version, it will repair your company file without upgrading it.
  • To finish repairing your data file apply all the instructions in the File Doctor.
  • If Still facing the issue and QuickBooks File Doctor does not resolve your error 6123, 0 try rebooting your computer.
  • After rebooting If QuickBooks File Doctor still fails to fix your 6123,0 error, then follow the manual given steps below.


  • Your QuickBooks must have the latest updates.
  • You must copy the file locally before trying to restore a backup or portable copy of the file.
  • You need to create a portable copy of the original file If you are getting this error when opening a backup (.qbb) file.
  • Turn off the hosting If you are the single user of QuickBooks Desktop. (File > Utilities > Stop Hosting Multi-User Access).
  • Note: the hosting is already turn off if there is Multi-User Access.
  • Now Restart your computer.

You have to perform the given instructions to get the best result. Maybe one solution is enough to fix the error listed below:

Setup all the settings manually

For Single-user setup:

Follow the given instruction for fix single-user settings manually

Rename .ND and .TLG file
  • Open the folder of your company file.
  • Choose the .ND file of your company file.
    • Example: MyCompanyName.qbw.nd
  • Now Right-click on the .ND file and select Rename.
  • Then Add .old at the end of the file name.
    • Example: MyCompanyName.qbw.nd.old
  • Repeat the same steps to rename the.TLG file
  • Open QuickBooks Desktop Company file.
Set proper folder permissions

Sometimes the folder settings need to be set to full access. It’s depending on your Windows settings and Windows User Login.

Move company file to a different location
  • To check if there is a problem with the file path, you have to move the file to a different location and open it from there to check if it works properly.
  • Go to the folder where your company files located on your computer.
  • Then Right-click on the company file and then select Copy.
  • Verify that you copy the correct file with the extension .QBW.
  • Now copy your file to the desktop, right-click on a blank space, select New > Folder.
  • Open that New Folder and then Paste there.
  • Now Open your QuickBooks and access your company file from the new location.
Use the Auto Data Recovery Feature

Use auto data recovery to resolve the data damaged.

Create a new Windows User

You can try to create a new window user login and try to open your file from there. Because there is also some change that your Windows User Login is corrupted.

  • Click the Windows Start button.
  • Select or type Control Panel.
  • Click on User Accounts Icon.
  • Select Create New User option.
  • Be sure to select Administrator for user type.
  • Log out of the current user.
  • Now Restart the computer, and then log in to the new user account.
  • After that move your company file to the Desktop.
  • Then Open your QuickBooks and access the company file from the new location.

For Multi-user setup:

Rename .ND and .TLG file
  • Open the folder of your company file.
  • Choose the .ND file of your company file.
    • Example: MyCompanyName.qbw.nd
  • Now Right-click on the .ND file and the click to Rename.
  • At the End of the file name add “.old”.
    • Example: MyCompanyName.qbw.nd.old
  • Do the same steps again to rename the .TLG file
  • Now Open QuickBooks Desktop Company file.
  • Re-scan Company file using Database Server Manager
    • First, Stop the Database Server process
      •  Windows 10 & 8
        • Press Windows Key and then type Task Manager.
        • Now Click on Task Manager and then click on More details.
        • Choose the Details tab.
        • Locate QBDBMgrN.exe the right-click on it and select End Task.
        • Repeat the above step 4 until all instances of QBDBMgrN.exe have been stopped.
        • Now Close the Task Manager.
      • Windows 7
        • Press Ctrl+Alt+Delete on your keyboard.
        • Select Task Manager.
        • To sort the entries alphabetically, click on the image name column heading from the Processes tab.
        • Right-click QBDBMgrN.exe, then select End Task.
        • Repeat the same step iv to stop all instances of QBDBMgrN.exe.
        • Close the Task Manager.
    • Restart QuickBooks Services
      • Press Windows Key+R to open the Run window.
      • Then type services.msc, and press Enter.
      • Choose the Name column heading to sort the entries alphabetically from the Services window
      • Right-click on the convenient service for your QuickBooks Desktop version, and then select Start:
        • QB Desktop 2019 or QBD Enterprise 19.0: QuickBooksDB29
        • QBD 2018 or QBD Enterprise 18.0: QuickBooksDB28
        • QBD 2017 or QB desktop Enterprise 17.0: QuickBooksDB27
        • QB Desktop 2016 or QB Desktop Enterprise 16.0: QuickBooksDB26
      • Close Services.
    • Re-scan company files
      • Open QuickBooks Database Server Manager.
      • To scan, Browse for the location of the QuickBooks company file.
      • Now Close QuickBooks Database Server Manager.
      • Open your company file.
Set proper folder permissions.

On the host computer, the folder contains the QuickBooks Desktop company file. It must allow full control to all users, including the QuickBooks Data Server Manager user.

Move company file to a different location
  • To see whether there is a problem with the file path, move the file to a different location, then open it from that location to see if it works.
Check Firewall & Antivirus Ports
Toggle Hosting Settings in QuickBooks:
  • Open your Company File.
  • Now Choose the File > select Switch to Single User Mode.
  • Then Choose the File > Utilities >select Stop Hosting Multi-User Access.
  • Choose File> Utilities > select Host Multi-User access.
  • Choose File> select Switch to Multi-User Mode.

Reinstall QuickBooks

Troubleshoot possible data damage

Just follow the above steps to resolve the error issue.

We hope that this article really helps, For specific troubleshooting steps to resolve the other possible causes of this error, contact QuickBooks Error Support Phone Number +1-855-441-4417.

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