Understanding Error Code 6123 in QuickBooks Desktop

error code 6123 in quickbooks desktop

QuickBooks Desktop is a popular accounting software used by many businesses to manage their finances. However, like any software, it can encounter errors that can cause inconvenience and frustration to users. One of the most common errors encountered by QuickBooks Desktop users is Error Code 6123. In this article, we will discuss what Error Code 6123 is, its causes, and how to fix it.

What is Error Code 6123?

Error Code 6123 is a common error that occurs when users try to open a company file in QuickBooks Desktop. It is usually accompanied by an error message that says, “Error -6123,0: Connection to the QuickBooks company file has been lost.” This error can prevent users from accessing their company file, which can be a major problem for businesses that rely on QuickBooks for their accounting needs.

Causes of Error Code 6123

There are several reasons why Error Code 6123 may occur in QuickBooks Desktop. One of the most common causes is a damaged or corrupted company file. This can happen due to various reasons such as power outages, network issues, or hardware problems. Another possible cause of Error Code 6123 is an outdated version of QuickBooks Desktop. If you are using an older version of QuickBooks, it may not be compatible with your operating system or other software installed on your computer.

How to Fix Error Code 6123

Fixing Error Code 6123 in QuickBooks Desktop can be a bit tricky, but there are several solutions you can try to resolve the issue. Here are some of the most effective ways to fix Error Code 6123:

1. Restart your computer and QuickBooks Desktop

Sometimes, all it takes to fix Error Code 6123 is to restart your computer and QuickBooks Desktop. This can help refresh your system and clear any temporary files that may be causing the error.

2. Update QuickBooks Desktop

If you are using an older version of QuickBooks Desktop, it may be time to update to the latest version. Updating QuickBooks can help fix any bugs or compatibility issues that may be causing Error Code 6123.

3. Use the QuickBooks File Doctor tool

QuickBooks File Doctor is a free tool provided by Intuit that can help diagnose and fix common QuickBooks errors, including Error Code 6123. To use this tool, simply download and install it on your computer, then follow the on-screen instructions.

4. Restore a backup of your company file

If your company file is damaged or corrupted, restoring a backup of your file may be the best solution. This will allow you to access a previous version of your file before the error occurred.

5. Disable antivirus software temporarily

Sometimes, antivirus software can interfere with QuickBooks Desktop and cause Error Code 6123. To fix this issue, try disabling your antivirus software temporarily and see if the error goes away.

6. Contact QuickBooks Support

If none of the above solutions work, it may be time to contact QuickBooks Support for assistance. They can provide more advanced troubleshooting steps or help you recover your company file if it is irreparably damaged.

Preventing Error Code 6123

Prevention is always better than cure, and this applies to QuickBooks errors as well. Here are some tips to help prevent Error Code 6123 from occurring:

1. Backup your company file regularly

Backing up your company file regularly can help ensure that you always have a recent version of your file in case of any errors or data loss.

2. Keep your QuickBooks Desktop updated

As mentioned earlier, keeping your QuickBooks Desktop updated can help prevent compatibility issues and bugs that may cause errors like Error Code 6123.

3. Use a reliable antivirus software

Using a reliable antivirus software can help protect your computer from malware and other threats that may cause errors in QuickBooks Desktop.


Error Code 6123 can be a frustrating issue for QuickBooks Desktop users, but it is not an insurmountable one. By following the solutions outlined in this article and taking preventive measures, you can ensure that your QuickBooks experience is smooth and error-free. If you are still having trouble with Error Code 6123, don’t hesitate to contact QuickBooks Support for assistance.

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