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Recommended Tricks to Eliminate QuickBooks Error 6123

Author: Alastor Moody
by Alastor Moody
Posted: Jul 27, 2025

When trying to restore, open, or upgrade your company file, QuickBooks error 6123 frequently appears. The system's firewall restrictions, corrupted data files, or any antivirus program could be the source of this error number. It also occurs when a company file is opened from a network that has multiple users.

You will receive the following error message on your screen as you get this error 6123, 0 in QuickBooks:

Error 6123, 0: "We’re sorry, but QuickBooks can’t open your company file."

Continue reading this blog to learn about the causes and procedures to resolve the issue instantly, and then resume your work on the application.

If you're new to this and do not have good technical expertise to resolve the error code 6123 on your QB. Don’t panic, our staff are available here to help you and resolve your issues regarding the same. Call +1(855)-738–0359.

Why Are You Getting Error 6123 0 in QuickBooks Desktop?

Various reasons trigger the error code 6123 0 on your QBDT, in which we’ve covered a few of them in our blog; check it out:

  • If the Windows operating system crashes or is damaged

  • By various QuickBooks Database servers that are operating on your machine

  • By restoring the backup from external storage or online storage

  • A faulty network connection can indicate a QuickBooks issue, specifically error code 6123

  • Error 6123, 0 QuickBooks may show up when you try to open the same company file on a different version of QuickBooks

  • QuickBooks is an outdated version of the program

3 Solutions to Eliminate QuickBooks Error 6123 0 from your Desktop

Continue to this segment of fixing it, which will provide you with the solutions to remove the error code 6123 from your system.

Method 1: Using the Hard Drive to Restore the Company File
  • Make a copy of the (.qbb) file that was saved online, on an external drive, or over a network

  • If the file is stored somewhere else, do not open it

  • Paste the file to a convenient spot on your hard drive, ideally the desktop of your computer

  • Use this file to carry out the backup restoration

Method 2: Creating a Portable Backup File Copy
  • On the machine where the backup was first created, launch QuickBooks Desktop

  • On this computer, open your company file

  • Then click on the File menu and choose Create Copy

  • After choosing Portable Company File from the list of possibilities, click Next

  • Give this file a distinctive name and save it in a convenient location

  • Select OK when prompted after clicking the Save button

  • This file can now be saved online or exported to a flash drive

Method 3: Modify the QB application's hosting configuration
  • Launch the QuickBooks company file

  • If the company file is already open in multi-user mode, select the file tab and then select the switch company file to single-user mode

  • Using the file> utilities option, you can also take this step and disable hosting multi-user access

  • Once again, navigate to File> Utilities> Host Multi-User Access to enter multi-user mode. When asked if you want to host multi-user access, choose yes

  • Finally, choose the file tab and then multi-user mode

ConclusionThis blog has attempted to cover all the essential information about QuickBooks error 6123, from its causes to troubleshooting procedures, all of which are covered here. However, if you still encounter this error, dial +1(855)-738–0359, and our experts will connect with you.Frequently Asked Questions About QuickBooks Error 6123

What is QuickBooks Error 6123 and when does it appear?

QuickBooks Error 6123 typically appears when you try to open, upgrade, or restore a company file. It may show a message stating that QuickBooks cannot open the company file due to a connection failure to the host computer.

Why does QuickBooks Error 6123 keep showing up?

This error can occur due to corrupted company files, damaged Windows user profiles, firewall interruptions, or multiple QuickBooks Database Services running on the same system. Improper network settings can also trigger it.

Can a damaged company file cause QuickBooks Error 6123?

Yes, a damaged or corrupted company file is one of the main reasons behind this error. QuickBooks may fail to connect or load the file if it detects unreadable or missing components in the data.

Does QuickBooks Error 6123 affect multi-user mode?

It can impact both single-user and multi-user modes, especially when the software is unable to establish a stable connection with the host or server system. This can disrupt collaboration and shared file access.

How can QuickBooks Tool Hub help fix Error 6123?

QuickBooks Tool Hub includes multiple utilities designed to repair company files and resolve network-related errors. The File Doctor tool within it is particularly effective at identifying and repairing issues that trigger Error 6123.

Is QuickBooks Error 6123 related to network settings?

Yes, incorrect network configurations or blocked communication between the workstation and host can lead to this error. Ensuring that QuickBooks has proper access through the firewall and network permissions is critical.

Can antivirus or firewall software cause Error 6123 in QuickBooks?

Security software like antivirus or firewalls can sometimes block QuickBooks from accessing necessary files or services. Temporarily disabling or configuring them properly can resolve the issue in many cases.

What role does the.ND file play in Error 6123?

The.ND (Network Data) file helps QuickBooks locate and open the company file in a multi-user environment. If this file is damaged or misconfigured, it can prevent access and trigger Error 6123.

Is there a way to prevent QuickBooks Error 6123 in the future?

Regularly backing up your company file, updating QuickBooks to the latest version, and running diagnostics using QuickBooks Tool Hub can help prevent this error from returning.

Can reinstalling QuickBooks fix Error 6123 permanently?

Reinstalling QuickBooks may resolve the error if the problem stems from a corrupted installation. However, if the issue lies in the company file or network, additional steps may be required for a permanent fix.

Should I rename the.ND and.TLG files to fix Error 6123?

Yes, renaming the.ND and.TLG files is a known solution. QuickBooks will recreate these files automatically, which can often resolve errors related to connectivity and file access.

What should I do if none of the fixes work for Error 6123?

If all common fixes fail, it's best to contact a certified QuickBooks professional who can provide advanced troubleshooting. Sometimes, deep file corruption or complex network issues require expert support.

About the Author

Alastor Moody is a tech-savvy accounting professional at Asquare Cloud Hosting who enjoys resolving technical issues.

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Author: Alastor Moody

Alastor Moody

Member since: Apr 18, 2025
Published articles: 38

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