How To Fix QuickBooks Error code 6123, 0- Problem Connecting To Server

QuickBooks error code 6123 is commonly seen when a user tries to restore a backup of a company file. This error code pops up without any prior prompting and interrupts the company’s file activities. The user may also face the same error when opening a company file from a multi-user network. Or if the user opens the file directly from the network or restores the backup. The error message that appears with this error code states “Problem connecting to server”. When you are opening a company file on a network or multi-user mode, you may see error-6123, 0 message on your computer screen

This error is usually generated while opening your company file over a network or multi-user mode, upgrading a company file to a newer version of QuickBooks, or you unable to restore the backup because of a 6123, 0 error message. So, simply if you ever face this problem when working with QuickBooks, you can fix the error with QuickBooks File Doctor. But if the file doctor can’t help you to run your system then go to the manual steps that are also given below.

According to Intuit, QuickBooks Error code -6123,0 “Connection to the QuickBooks company file has been lost” occurs when you are trying your company files in multi-user environments or while upgrading your company file to a newer version.

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 Occurs

  • 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 while upgrading/opening a company file in QuickBooks Desktop

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

Solution 1: Manually Setup all the settings

For Single-User setup

Follow the given instruction for fix single-user settings manually

Step 1: 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.
Step:2 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.

Step 3: 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.
Step 4: Use the Auto Data Recovery Feature

Use auto data recovery to resolve the data damaged.

Step 5: 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

Step 1: 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.
Step 2: 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.

Step 3: Move the 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.
Step 4: Check Firewall & Antivirus Ports
Step 5: 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.

Solution 2: Run QuickBooks File Doctor

  • 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:

Solution 3: Reinstall QuickBooks

  • Uninstall and then reinstall your QuickBooks.

Solution 4: Troubleshoot possible data damage

Solution 5: Use the Auto data recovery function

Auto data recovery; QuickBooks Error code 6123

Restore the .ADR copy of this file and see if it works. There is a possibility that the file is corrupt and it may resolve QuickBooks error code 6123, 0.

Solution 6: Disable the System Security programs

Mostly your antivirus program hinders company files and operates them as malware or viruses. For this reason, the user may not have the capacity to start their QuickBooks company file. In that case, you have to disable the QuickBooks application and then open the company file. Usually, this step automatically fixes this error code 6123, 0.

Solution 7: Create a New windows user

Your current Windows user login may be at risk of corruption. To fix the problem you have to create a new Windows user.

Steps to create new users:

  • Firstly, Go to the “Control Panel”., look for the “Create New User Choice” selection in the “User” option.
Create a new Windows Admin User
  • Later, select the Administrator for user type and log out from the existing user.
  • Now, Restart your computer and Login by using new user credentials(username & password).
  • Relocate the company file to the desktop location.
  • And lastly, start QuickBooks and now try to access the company file.

Solution 8: Set proper folder permissions

Set proper folder permissions; QuickBooks Error code 6123

The user needs the user in a folder containing the QuickBooks desktop company file on the host computer. This allows full control to users, including the QuickBooks Database Server Manager user,

Try to follow all the above solutions to resolve the error issue. Hope these above-discussed solutions will help you to resolve QuickBooks error code 6123. If you need any technical help, please feel free to call us on toll-free +1-844-541-8444 and get quick support from our Intuit certified ProAdvisor.

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