QuickBooks company file error H303 is an H-series error and is related to the multi-user mode in QuickBooks. This error usually appears when your file is stored on a server, and someone is trying to access it from the workstation, but this error occurs and prevents access. Damaged data, firewall, and hosting settings can be the reason for this company file error. Fixing this issue without delay is crucial because it blocks the access of your files and affects the entire workflow. Let’s discuss the troubleshooting method to fix QuickBooks error H303.

Reasons For QB Error Code H303

Identifying the root causes of the error is crucial to understand the resolution. We have listed down the reasons:

• QuickBooks desktop multi-user mode not working, and QB error H303 can appear due to wrong firewall settings. 
• Damaged or corrupted data can also trigger this error. 
• Incorrect hosting settings are the prime reason for company file-related errors.

Solutions For Fixing Error Code H303

After identifying the reasons, let’s jump to the troubleshooting methods and resolve error H303 in no time.

Recommended to read: How to fix QuickBooks desktop payroll not updating issue

Method 1: Use the QuickBooks File Doctor Tool

The QuickBooks File Doctor Tool helps fix problems with your company files and components. Here’s how to use it to resolve QuickBooks Error H303:

• Close QuickBooks.
• Download the latest version of QuickBooks Tools Hub to your server computer.
• Install the downloaded file.
• Follow the on-screen instructions.
• Click the "Company File Issues" tab after opening QuickBooks Tool Hub.
• Select ‘Run QuickBooks File Doctor’.
• Choose your file from the Company File drop-down menu, then click ‘Continue.’
• Enter your QuickBooks password and click ‘Next’.

Additionally, you can use the QuickBooks Database Server Manager to address network issues:

• In QuickBooks Tool Hub, go to the Network Issues section.
• Click ‘Start scan’ under QuickBooks Database Server Manager.
• The tool will resolve the firewall permission issues.
• After the scan, click ‘Close.’

After running these tools, try accessing your file again. 

Method 2: Check QuickBooks Hosting Settings

Incorrect hosting settings can cause QuickBooks Error H303. 

• Open QuickBooks on all servers and workstations.
• Go to the ‘File’ menu.
• Select ‘Utilities’.
• Click ‘Stop Hosting Multi-User Configuration’.
• Go back to the ‘File’ menu.
• Click ‘Host Multi-User Configuration’ from the ‘Utilities’ section.
• Restart your system and see if the issue is resolved.

After checking hosting settings, review and adjust your firewall settings.

Method 3: Adjust Firewall Settings

A firewall might block file transfers, causing errors. To fix this:

• Open the Start menu.
• Open the Control Panel. 
• Select ‘Firewall Settings’.
• Click ‘Allow a program through the firewall.’
• Add QuickBooks to the exception list using the ‘Add Programs’ option.
• Restart your computer.

Conclusion

After following the methods given in this blog, you can effectively resolve QuickBooks error H303.