How to Fix the QuickBooks Sync Manager Not Working Error

When QuickBooks Sync Manager stops working, QuickBooks Desktop can fail to synchronize data with connected applications or services. The problem can occur while QuickBooks is exchanging data, after a software or Windows update, or when network, firewall, installation, or company-file issues interrupt the synchronization process. The issue can create problems such as incomplete data transfers, outdated information in connected applications, failed integrations, duplicate or missing data, and interrupted accounting workflows. QuickBooks can display messages such as

• “Invalid argument. The specified record does not exist in the list”
• “The QuickBooks file is not available”
• “Critical Error during sync: Permission Denied”
• “Unable to sync: QBWC ERROR: 3391- The iteratorID is not valid”

In this guide, we’ll discuss whether QuickBooks Sync Manager is still available, what causes QuickBooks Sync Manager not working errors, what to check before troubleshooting, methods to fix the error, and how to prevent QuickBooks sync errors in the future.

Is QuickBooks Sync Manager Still Available?

No. Intuit Sync Manager for QuickBooks Desktop is no longer available. Intuit discontinued Sync Manager for Desktop effective May 31, 2016, and third-party applications can no longer use the discontinued service. Thus, you should not download or reinstall an old Sync Manager utility to resolve a current QuickBooks sync problem.

Note: If you encounter QuickBooks Sync Manager not syncing today, the issue may involve a third-party integration, QuickBooks Web Connector, network or firewall settings, or another QuickBooks Desktop component.

What Causes the QuickBooks Sync Manager Not Working Error?

QuickBooks Desktop sync issues occur when network restrictions, damaged files, incorrect integration settings, or outdated software interrupt data synchronization.

Here are the key causes of the QuickBooks Sync Manager Not Working Error:

• Network or firewall restrictions.
• Damaged QuickBooks program files.
• Incorrect integration configuration.
• Conflicting or inconsistent company data.
• Outdated QuickBooks Desktop software.
• Third-party integration compatibility issues.
• QuickBooks Web Connector problems.

What to Check Before You Fix the QuickBooks Sync Manager Not Working Error?

Before fixing the QuickBooks Sync Manager not working error, verify your QuickBooks version, synchronization component, permissions, company file access, and security settings to identify the actual cause.

Here are the key checks to complete before troubleshooting the QuickBooks synchronization error:

Parameter	Details
QuickBooks version	Confirm that QuickBooks Desktop is updated to the latest available release for your version.
Sync component	Identify whether the issue involves QuickBooks Web Connector, a third-party integration, or another synchronization service.
Administrator access	Sign in to Windows with administrator privileges to allow QuickBooks to access required files and settings.
QuickBooks processes	Close unresponsive QuickBooks processes, such as QBW32.exe, through Task Manager before restarting QuickBooks.
Company file and folder path	Verify that the company file opens correctly and that QuickBooks can access its storage location.
Integration settings	Check that the connected application is authorized, correctly configured, and compatible with your QuickBooks version.
Network connection	Ensure your internet connection is stable and can support communication with connected services.
Firewall and antivirus	Make sure security software does not block QuickBooks, Web Connector, or the connected application.
Company file backup	Create a current backup before changing settings or running repair and troubleshooting tools.
Error message or code	Record the exact error message or code to help identify the underlying synchronization problem.

How Can I Fix QuickBooks Sync Manager Not Working Error

To fix the QuickBooks Sync Manager not working error, update QuickBooks Desktop, verify Web Connector or Integrated Applications settings, check company-file access, and resolve network, permission, or program issues. Since Intuit discontinued Sync Manager, current troubleshooting focuses on supported QuickBooks synchronization components.

Here are the methods to fix QuickBooks Sync Manager not working errors and restore synchronization:

Method 1. Update QuickBooks Desktop

An outdated QuickBooks Desktop release can cause compatibility problems with connected applications and Web Connector.

To update QuickBooks Desktop, follow these steps:

• Close all open company files and QuickBooks Desktop.
• Open Windows Start and search for QuickBooks Desktop.
• Right-click QuickBooks Desktop and select Run as administrator.
• Keep QuickBooks on the No Company Open screen.
• Select Help > Update QuickBooks Desktop.
• Open the Options tab and select Mark All.
• Select Save.
• Open the Update Now tab.
• Check Reset Update.
• Select Get Updates.
• Close and reopen QuickBooks after the update downloads.
• Select Yes when prompted to install the update.
• Restart your computer.
• Open QuickBooks and test the synchronization again.

Method 2. Repair QuickBooks Program Components

Damaged QuickBooks program files or Windows components can interfere with QuickBooks and connected applications.

Use QuickBooks Tool Hub to repair the program with these steps:

• Close QuickBooks Desktop.
• Open QuickBooks Tool Hub.
• Select Program Problems.
• Select Quick Fix My Program.
• Allow the tool to close QuickBooks processes and complete the repair.
• Restart your computer.
• Open QuickBooks.
• Open the affected company file.
• Test the connected application.

If the problem continues, use the QuickBooks Program Diagnostic Tool available through Tool Hub to check and repair relevant Microsoft components.

Method 3. Reset the QuickBooks User Configuration

A damaged QBWUSER.ini file can cause unexpected QuickBooks behavior.

Refresh the QuickBooks user configuration as follows:

• Close QuickBooks Desktop.
• Open File Explorer.
• Navigate to:
• C:\Users[Your User Name]\AppData\Local\Intuit\QuickBooks [Year]
• Locate QBWUSER.ini.
• Right-click the file and select Rename.
• Add .old to the filename, such as QBWUSER.ini.old.
• Reopen QuickBooks.
• Manually open the affected company file.
• Test the connected application.

Note: Renaming QBWUSER.ini removes the list of previously opened company files, so you may need to open those files manually again.

Method 4. Reconnect the QuickBooks Web Connector Application

An incorrect, missing, or duplicate Web Connector registration can prevent a third-party application from communicating with QuickBooks.

Reconnect the Web Connector application using these steps:

• Open QuickBooks Desktop.
• Sign in as the QuickBooks Admin.
• If QuickBooks is in multi-user mode, select File > Switch to Single-user Mode.
• Open QuickBooks Web Connector.
• Check whether the affected application is already listed.
• If the registration is missing, incorrect, or duplicated, follow the integration provider’s instructions to remove the affected entry.
• Obtain the latest .QWC file from the integration provider.
• In Web Connector, select Add an Application.
• Select the correct .QWC file.
• Approve the access request.
• Enter the application password if prompted.
• Run the synchronization again.

Method 5. Verify Integrated Application Permissions

QuickBooks can prevent a third-party application from accessing the company file when authorization settings do not permit access.

Review the application’s access permissions with these steps:

• Open the affected company file.
• Sign in as the QuickBooks Admin.
• Switch to Single-user Mode if required.
• Select Edit > Preferences.
• Select Integrated Applications.
• Open Company Preferences.
• Select the affected application.
• Select Properties, if available.
• Make sure Don’t allow any applications to access this company file is not selected.
• Approve the application’s access request.
• Save the settings.
• Run the synchronization again.

Method 6. Check the Company File Location

Web Connector can fail when a company file has been moved or renamed without updating the connected application.

Verify the company file location with these steps:

• Open QuickBooks Desktop.
• Confirm that the affected company file opens normally.
• Check whether the company file was recently moved or renamed.
• Confirm that the integration is configured to use the current company file information.
• If Web Connector still references the previous file, follow the integration provider’s reconnection process.
• If you plan to permanently move or rename the company file, remove the affected application from Web Connector first.
• Make the required location or filename change.
• Reconnect the application using the supported setup process.
• Run the synchronization again.

Important: If an existing integration still depends on the previous file location, Intuit may recommend restoring the previous name or location. If you want to permanently move or rename the file, remove the application from Web Connector first and reconnect it afterward.

Method 7. Check Firewall and Internet Security Settings

Firewall or antivirus restrictions can prevent QuickBooks and Web Connector from communicating with connected services.

Check your security settings using these steps:

• Open Windows Defender Firewall with Advanced Security.
• Review Inbound Rules for blocked QuickBooks or Web Connector components.
• Review Outbound Rules.
• Allow the required QuickBooks components through the firewall when your security configuration is blocking them.
• Check your antivirus software for blocked QuickBooks or Web Connector processes.
• Add required applications to antivirus exceptions when appropriate.
• Restart your computer.
• Open QuickBooks and test the synchronization.

Method 8. Repair the QuickBooks Company File

Company file data damage can cause unusual QuickBooks behavior and interfere with processes that exchange information with connected applications.

Check and repair the company file with these steps:

• Open QuickBooks Desktop.
• Open the affected company file.
• Select File > Utilities > Verify Data.
• Allow the verification process to complete.
• If QuickBooks reports “Your data has lost integrity,” select File > Utilities > Rebuild Data.
• Create a backup when prompted.
• Allow the rebuild process to complete.
• Run Verify Data again.
• Confirm that QuickBooks no longer reports data damage.
• Reopen the company file and test the synchronization.

Method 9. Check Web Connector Error Codes

Web Connector error codes can identify specific connection, permission, registration, or company-file problems.

Use the error code to narrow down the problem:

• Open QuickBooks Desktop.
• Open Web Connector.
• Record the complete error code and message.
• Confirm that the required company file is open and accessible.
• Check whether the error refers to permissions, registration, or company-file location.
• Review the .QWC application registration if the problem involves setup.
• Check the Web Connector log when the error points to a logging or file-access issue.
• Apply the fix specific to the error.
• Run the synchronization again.

For example, QBWC1039 can occur because of a moved or renamed company file, insufficient permissions, incorrect application registration, or duplicate application registration.

Method 10. Reinstall QuickBooks Desktop

Reinstalling QuickBooks can replace damaged installation components when updating, repairing, and running diagnostic tools do not resolve the problem.

Reinstall QuickBooks Desktop with these steps:

• Create a current backup of your company file.
• Close QuickBooks Desktop.
• Open Control Panel > Programs and Features.
• Select QuickBooks Desktop.
• Select Uninstall/Change.
• Follow the prompts to remove the installation.
• Restart your computer if prompted.
• Reinstall the correct QuickBooks Desktop version from an authorized Intuit source.
• Install the latest available release.
• Open your company file.
• Reconnect Web Connector or the third-party application using its supported setup process.
• Test the synchronization.

What Are the Common QuickBooks Sync Manager Error Codes and Their Solutions?

Common QuickBooks Sync Manager error codes such as 5_13944, 17_7118, and 17_7300 are associated with the discontinued QuickBooks Desktop Sync Manager. These errors historically involved connectivity, software compatibility, and company-file synchronization issues.

Here are the common QuickBooks Sync Manager error codes and their solutions:

#Error 1: QuickBooks Sync Error 5_13944

QuickBooks Sync Error 5_13944 is a legacy error associated with problems uploading data during synchronization.

Follow these steps to fix QuickBooks Sync Error 5_13944.

• Check that your internet connection is stable.
• Update QuickBooks Desktop to the latest available release.
• Check Windows Firewall and antivirus settings for blocked QuickBooks or Web Connector components.
• Open QuickBooks Web Connector and verify that the affected application is registered correctly.
• Go to Edit > Preferences > Integrated Applications > Company Preferences and review the application’s access permissions.
• If the Web Connector registration is missing or incorrect, reconnect the application using its current .QWC file.
• Run the synchronization again.

If the error occurs only in an old QuickBooks environment that still uses the discontinued Sync Manager, treat it as a legacy issue rather than downloading or reinstalling Sync Manager.

#Error 2: QuickBooks Sync Error 17_7118

QuickBooks Sync Error 17_7118 is a legacy Sync Manager error that can indicate compatibility or QuickBooks program-component problems.

Use the following process to fix QuickBooks synchronization error 17_7118:

• Close QuickBooks Desktop.
• Reopen QuickBooks as an administrator.
• Select Help > Update QuickBooks Desktop.
• Open the Options tab and select Mark All.
• Select Save.
• Open the Update Now tab.
• Select Reset Update.
• Select Get Updates.
• Restart your computer after installing the update.
• Open QuickBooks and test the synchronization.
• If the problem persists, open QuickBooks Tool Hub.
• Select Program Problems > Quick Fix My Program.
• Reopen QuickBooks and test the connected application.

Note: Do not attempt to update the discontinued Intuit Sync Manager itself. Current troubleshooting should focus on QuickBooks Desktop and the supported integration component.

#Error 3: QuickBooks Sync Error 17_7300

QuickBooks synchronization error 17_7300 is a legacy error associated with problems writing synchronized data to the QuickBooks company file.

Check the integration permissions with these steps:

• Open QuickBooks Desktop.
• Open the affected company file.
• Sign in as the QuickBooks Admin.
• Switch to Single-user Mode if required.
• Select Edit > Preferences.
• Select Integrated Applications.
• Open Company Preferences.
• Select the affected application.
• Verify that QuickBooks allows the application to access the company file.
• Review the application’s properties and authorization settings, if available.
• Save the changes.
• If the application uses Web Connector, verify its registration and reconnect it when necessary.
• Run the synchronization again.

Important: Older guides may instruct you to select Intuit Sync Manager under Integrated Applications. That option relates to the discontinued Sync Manager and should not be presented as a current QuickBooks Desktop fix.

How Do You Fix QuickBooks Sync Manager Errors After a Windows Upgrade?

To fix QuickBooks Desktop sync issues after a Windows upgrade, update and repair QuickBooks Desktop, then check Web Connector, Integrated Applications, and security settings to restore synchronization. Since Sync Manager is discontinued, focus on the supported QuickBooks components used for third-party integrations.

Here are the steps to fix QuickBooks Sync Manager errors after a Windows upgrade:

• Restart Windows and open QuickBooks Desktop.
• Confirm that the affected company file opens normally.
• Update QuickBooks Desktop to the latest available release.
• Open QuickBooks Tool Hub.
• Select Program Problems > Quick Fix my Program.
• Check Web Connector and Integrated Applications permissions.
• Check whether firewall or antivirus software blocks the current QuickBooks integration components.
• Reconnect the third-party application if its registration was affected.
• Run the synchronization again.

How to Prevent QuickBooks Sync Errors in the Future?

To prevent future QuickBooks sync errors, keep QuickBooks and connected applications updated, maintain accurate data mapping, monitor integration logs, and control transaction and accounting-period conflicts.

• Ensure SKUs, items, customer records, accounts, and tax codes correspond correctly across connected systems.
• Use unique invoice and transaction numbers across platforms to avoid conflicts during synchronization.
• Ensure all pending transactions sync successfully before applying lock dates or closing an accounting period.
• Review integration logs regularly to identify failed transactions, expired credentials, character-limit issues, or configuration problems early.

Conclusion

To fix the QuickBooks Sync Manager not working error, update QuickBooks Desktop, repair program components, verify Web Connector and Integrated Applications settings, check company-file access, review firewall and antivirus restrictions, repair damaged company data, and reconnect the affected third-party application. Since Intuit discontinued Sync Manager, current troubleshooting should focus on the supported synchronization components rather than legacy Sync Manager files or tools.

Frequently Asked Questions