Error H303 in QuickBooks is a very common H series error that appears when you try to access the company file. This error code can show up if the file hosting settings on the server are incorrect and need to be re-configured. There are a lot of issues that can trigger this error, but the most common one is the incorrect setup of the multi-user hosting. Users can’t access the QuickBooks company file because of this issue, which is why it needs to be fixed right away. If you also get the error code H303 in QuickBooks, you can fix it by using the troubleshooting solutions in this post.

If you can’t figure out how to fix the error H303 on your own, you can call us at +1(855)-738-0359 and ask for help from our certified team of QuickBooks Desktop experts

General Causes for QuickBooks Company File Error H303

Any of the following reasons could trigger this QuickBooks error message H303.

  1. The way QB file hosting settings are configured is incorrect, and you need to change it.
  2. QuickBooks can’t get the IP address to connect to the server where the company file is saved.
  3. The network data or the transaction log file is damaged or corrupt.
  4. The Windows firewall is causing a problem connecting to the company file saved on the server
  5. Important QuickBooks services like the QBCFMonitorService and the QBDBMgrN service are disabled on the server computer.
  6. The connection between the server computer and the workstation is disconnected.

How to Fix QuickBooks Desktop Error H303 with Step-by-Step Instructions?

You can get rid of QuickBooks error code H303 in the following ways.

Step 1: Fix Company File Problems by using the QBFD Tool Utility from the Tool Hub

If you get the error code H303 while working on the company file, there may be a problem with the file or with the connection. To fix these problems, you can use the QBFD tool by doing the following:

  1. Download QuickBooks Tool Hub from Intuit’s official website and install it on your PC by following the on-screen instructions.
  2. Once the tool is loaded, run it and go to the Company File Issues tab. From there, choose the QuickBooks File Doctor Tool.
  3. Launch the tool, locate the company file, and click the ‘Check your file and network’ option.
  4. When the tool is done with the troubleshooting, rerun QuickBooks to access the company file. 

Step 2: Start the QuickBooks Database Server and Scan for Problems

When the database server manager is not running or is disabled, error H303 can appear in QuickBooks Multi-User mode. You can launch the database server manager from the tool hub and fix the problems that triggered the error.

  1. Open the QuickBooks tool hub and click on the Network Issues tab to find the QuickBooks Database Server Manager.
  2. Click the ‘Start Scan’ button and run the ‘Server Manager,’ and this will automatically resolve any issues in the network and with the firewall.
  3. When the scan and repair process is done, rerun QuickBooks to see if you can access the company file.


If you follow the steps in this guide, you can get rid of the QuickBooks error H303 in no time. If the error is still not fixed, you can contact us at +1(855)-738-0359 for professional help from our team of experts.