QuickBooks Error H303: How to Fix and Prevent It

QuickBooks Error H303

QuickBooks is a widely-used accounting software that simplifies financial management for businesses of all sizes. However, QuickBooks users may encounter errors that impede their ability to work efficiently. One such error is QuickBooks Error H303, which occurs when a user tries to access a company file located on another computer. This error can be frustrating, but with the right knowledge, it can be resolved quickly. In this article, we will discuss the causes of QuickBooks Error Code H303 and provide five solutions with seven steps to fix it.


What is QuickBooks Error H303?

QuickBooks Error H303 is a common error that occurs when users attempt to access a company file located on a different computer. It typically indicates that QuickBooks is unable to establish a connection to the server where the company file is located. This error can also occur when a user tries to open a company file in multi-user mode, and QuickBooks is unable to establish a connection with the server.

Causes of QuickBooks Error H303

  • Improperly configured hosting settings in QuickBooks.
  • Firewall settings blocking communication between QuickBooks and the server.
  • Incorrect DNS settings.
  • Damaged or corrupt QuickBooks company file.
  • Outdated QuickBooks software.
  • Network connectivity issues.
  • Incorrect QuickBooks configuration settings.
  • Multiple QuickBooks database services running on the same computer.
  • A mismatch in the folder permissions of the company file.
  • Incorrectly configured QuickBooks Database Server Manager.

Solutions to Fix QuickBooks Error H303

Solution 1: Verify the Hosting Settings of QuickBooks

  • Go to the File menu in QuickBooks.
  • Select Utilities > Stop Hosting Multi-User Access.
  • Navigate to the File menu again and select Utilities > Host QuickBooks Multi-User Mode Access.
  • Ensure that the server is set as the hosting system and click Yes to confirm.

Solution 2: Check Firewall Settings

Check firewall settings

  • Navigate to the Windows Firewall settings and select Advanced settings.
  • Select Port in Inbound Rules > New Rule.
  • Select the TCP option and type the ports needed for QuickBooks communication (8019, 56728, and 55378).
  • Select Allow the connection and click Next.
  • Ensure that all profiles (Domain, Private, and Public) are selected.
  • Specify the rule’s name and click Finish.

Solution 3: Verify the DNS Settings

  • Select Network and Sharing Center from the Control Panel.
  • Change adapter settings should be selected.
  • Select Properties from the context menu when you right-click the Local Area Connection icon.
  • Then click the Properties button after selecting Internet Protocol Version 4 (TCP/IPv4).
  • The options to “Obtain an IP address automatically” and “Obtain DNS server address automatically” should both be checked.
  • To save the changes, click OK.

Solution 4: Set up a new folder for your company’s files

  • Create a new folder on the server.
  • Share the folder and provide full permissions to all users.
  • To create a new folder, copy the QuickBooks company file.
  • You can access QuickBooks by clicking the File menu.
  • Select Open or Restore Company and choose Open a company file.
  • Browse to the new folder and select the company file.
  • Click Open.

Solution 5: Restart QuickBooks Database Server Manager


  • Open the Run dialog box by pressing Windows + R.
  • Type services.msc and press Enter.
  • Locate QuickBooksDBXX (XX denotes the year of QuickBooks) and right-click it.
  • Select Restart QuickBooks Database Server Manager.


By following these solutions, users can easily fix QuickBooks Error H303 and get back to managing their finances efficiently. It’s important to keep your QuickBooks software up-to-date and maintain regular backups of your company file to prevent data loss and other issues. If you continue to experience issues with QuickBooks, don’t hesitate to reach out to customer support for further assistance.

Frequently Asked Questions (FAQs)

Q.1 How can I prevent QuickBooks Error H303 from happening again?

To prevent QuickBooks Error H303 from happening again, you should regularly maintain your QuickBooks software, perform regular backups of your company file, keep your network settings up-to-date, and avoid making changes to network configurations without proper knowledge or guidance.

Q.2 Do I need to be a technical expert to fix QuickBooks Error H303?

No, you don’t need to be a technical expert to fix Error H303 QuickBooks . However, it’s important to have some basic knowledge of network settings, firewall configurations, and QuickBooks settings to perform the necessary troubleshooting steps.

Q.3 Can QuickBooks Error H303 cause data loss?

QuickBooks Error Code H303 itself does not cause data loss, but it can lead to data loss if it’s not resolved in a timely manner. If you’re experiencing this error, it’s important to fix it as soon as possible to prevent any data loss or corruption.

QuickBooks Error H303: How to Fix and Prevent It

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