QuickBooks Error 6120, 0 – When Opening the Company File

QuickBooks Error 6120, 0

QuickBooks Error 6120 occurs when a user attempts to open a QuickBooks company file over a network or in multi-user mode, during a company file upgrade to a newer version of QuickBooks, or when the network connection between the host and local machine is interrupted, QuickBooks Error 6120 often appears. Additionally, this error can occur if firewall settings hinder communication between computers or if the company file is corrupted. Users are unable to successfully open the company file due to this error, and they may receive a message indicating that they are unable to connect to QuickBooks database services.

What are the Common Causes for QuickBooks Error Code 6120?

When confronting QuickBooks Error 6120 in Desktop, several factors beyond network issues or file damage can be involved. Here are possible causes:

  • Host Computer Configuration: Incorrect settings can prevent multiple users from accessing the company file, triggering Error 6120.
  • Third-Party Software Conflict: Security software might mistake QuickBooks Desktop as a threat, leading to the error.
  • Damaged Network Data File: A damaged Network Data (.ND) file, which allows QuickBooks to access a company file over a network, it can cause Error 6120.
  • Company File Update Over a Network: Updating QuickBooks company files over a changeable or incompatible network can result in this error.
  • Corrupt QuickBooks Installation: A faulty or incomplete installation of QuickBooks Desktop software can be the offender.
  • Multiple QuickBooks Database Services Running: If different versions of QuickBooks Database Services run on the same network, they may conflict, causing Error 6120.
  • Incorrectly Configured Network: An incorrect network setup or modifications incompatible with QuickBooks can trigger the error.
  • Power Outages or Surges: Unexpected shutdowns caused by power outages or outpourings can damage company files, leading to Error 6120 during restart.

Understanding these potential triggers is crucial for the effective diagnosis and resolution of Error Code 6120 in QuickBooks Desktop.

Also Read: QuickBooks Web Connector

What are the Common Solutions to Solve Error 6120?

With the help of this guide, we make sure to provide you with reliable solutions to solve QuickBooks Error 6120. To solve the given error, make sure you adhere to the following sequential steps to ensure a smooth resolution. 

Step 1: Update QuickBooks Desktop

To ensure optimal performance and resolve common issues in QuickBooks Desktop, it is essential to keep it up-to-date. Here are the list of steps to update QuickBooks Desktop:

  1. Launch QuickBooks Desktop.
  2. Navigate to the Help Menu.
  3. Select Update QuickBooks Desktop.
  4. Click Update Now in the upper right corner.
  5. Check the Reset Update box & click Get Updates.
  6. Once the update is complete, exit QuickBooks.

Step 2: Utilize QuickBooks File Doctor

The QuickBooks File Doctor is a highly regarded tool for resolving the QuickBooks Error 6XXX series. Here’s a revised and reorganized set of instructions:

  • Start by downloading the QuickBooks Tools Hub. You can find the download link on the Intuit website.
  • After downloading, access your downloads list by pressing CTRL+J.
  • From the downloads list, locate and select the QuickBooksToolsHub.exe file.
  • Confirm the action by clicking Yes.
  • Proceed with the installation process. Click Next, then accept the license agreement by clicking Yes.
  • Continue the installation by clicking Next, then select Install. The installation might take some time.
  • Once the installation is complete, click Finish.
  • Locate the QuickBooks Tool Hub icon on your desktop and open it.
  • In the Company File Issues tab, select Run QuickBooks File Doctor.

Step 3: Rename the .ND & .TLG Files

To resolve QuickBooks Error 6120, 0, in a network or multi-user environment, renaming the .ND and .TLG files can be a solution.

  1. Navigate to the default location of your QuickBooks company file: C:\Users\Public\Documents\Intuit\QuickBooks\Company File.
  2. Locate the files with the .ND & .TLG extensions.
  3. Right-click on each file and select “Rename.”
  4. Append “.OLD” to the end of the file name.
  5. For example:
    • Rename CompanyName.qbw.ND to CompanyName.qbw.ND.OLD
    • Rename CompanyName.qbw.TLG to CompanyName.qbw.TLG.OLD
  6. Confirm the changes by clicking “Yes.”

Step 4: Transfer Your Company Files to the Desktop

  1. Right-click on the desktop background and select New > Folder.
  2. Navigate to the location of your existing company file.
  3. Right-click on the company file and choose Copy or use Ctrl+C.
  4. Access the new folder you created on your desktop, right-click within it, and select Paste or use Ctrl+V.
  5. Hold down the Ctrl key, making sure to keep it pressed until the ‘No Company Open’ window appears.
  6. Click on Open or Restore an Existing Company.
  7. Choose Open a company file and click Next.
  8. Locate and select the company file you just copied to the new folder on the desktop.
  9. Click Open. If the company file does not open, move on to Step 5.

Step 5: Retrieve QuickBooks Backup File

If transferring the file to the desktop doesn’t resolve the issue, deeper problems may exist with your company file (.QBW). To address this, you can restore your most recent backup by following these steps:

  1. Exit QuickBooks Desktop.
  2. Hold down the Ctrl key until the “No Company Open” window appears.
  3. Select “Open or restore an existing company.”
  4. Click on “Restore a backup copy” and hit “Next.”
  5. Follow the on-screen prompts to complete the restoration of your latest backup.


If you’re still having trouble with QuickBooks, despite implementing the previously mentioned methods, we highly recommend seeking support from the QuickBooks Data Service Team at MyOnePro. Our skilled team of Data Service professionals is well-equipped to assist with resolving common errors, such as QuickBooks Error 6120, ensuring that your issue is addressed efficiently and with minimal disruption.


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