Quickbooks Error H303 [fixed]


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QuickBooks error h303 is a common error when it comes to errors related to the QuickBooks multi-user mode. You can encounter the h303 error whenever you try to access a file in multi-user mode. In case the file that you are trying to access needs any additional installation, you can face this error more commonly. We can not list a particular reason to face this error, but there can be different reasons that we have discussed later. In this article, we have tried you provide you with a better understanding of the QuickBooks error h303 and how to resolve the error if you face it.

Quickbooks error h303

Possible Reasons for the QuickBooks Error H303

The possible reasons that can lead to the Quickbooks error h303 are:

  • The network data file of your QuickBooks software is damaged.
  • You have not configured the computer network properly.
  • Multi-user mode in Quickbooks has an improper configuration.
  • Make sure that you are not hosting the file through the server. If you do, QuickBooks won’t be able to access it.
  • Incorrect firewall settings lead to the blocking of the application.

Indications of the QuickBooks Error H303

Here are the different types of signs that you face during the occurrence of the QuickBooks Error H303. 

  • Error message appears on the display. 
  • You may face problems when you are accessing the company file. 
  • Your operating system is freezing when you work. 
  • This error slows down your software performance.
  • You are unable to open the settings of the multi-user.

Methods to Fix the QuickBooks H303 Error

Below we have mentioned different methods using which you can resolve the QuickBooks error H303. All the methods have been mentioned in detail to make it easier for you to carry out the process.

Configure QuickBooks

The very first method that we are going to discuss is to change the settings of the QuickBooks application. Below all the steps related to it have been mentioned.

  • First, you are needed to start QuickBooks in a multi-user mode.

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  • Next, you will have to open the company file on all the systems and then disable the multi-user mode from every system.

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  • Next, you will have to Turn on the QuickBooks multi-user mode on one of the systems and then start the QuickBooks application on every system.

Move the QuickBooks File to Another Folder

The next method is to change the folder to store the QuickBooks file and then access the file.

  • First, you are needed to create a new folder to store the QuickBooks file.
  • After this, you will have to set permissions to share and access the file.
  • Now, you will have to copy the QuickBooks file and then paste it to the new folder.
  • Once done, you will have to try to access the file again in the multi-user mode.

Download the QuickBooks File Doctor Tool

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The next recommended solution is to download and install the QuickBooks file doctor tool on your system. You can easily download it from the QB website and then install it by following the instructions that will appear on your screen. You can also download the QuickBooks file doctor tool with the help of the QuickBooks tool hub. Running the QuickBooks file doctor tool will diagnose your problem and then fix the process. 

Change the Settings of the Firewall

The next step is to change the settings of the firewall by following the steps that we have mentioned below.

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  • First, you are needed to go to the control panel on your system.
  • After this, you will have to go to the firewall option.
  • Next, you will have to select the option to select applications to allow and then select the QuickBooks application.
  • At last, you will have to restart the system and then open the QuickBooks software.
Read more:- How to configure QuickBooks firewall ports? 


This was all about the QuickBooks error h303. We have provided you with all the methods that you can use to fix the QuickBooks error h303. In case, if you fail to resolve the error, you can ask for technical aid from our experts.

Frequently Asked Questions (FAQs)

Q.1 How do I fix a QuickBooks error?

You can easily fix all the QuickBooks errors as so many tools are floating on the internet. The best tool for removing errors is the QuickBooks tool hub. You can simply use this tool, and by following the quick fix steps, you can simply remove the error. 

Q.2 How do I reset QuickBooks?

One can easily reset QuickBooks by signing in to the online company file. Here, you are required to see a summary of deleted files. You need to clear that data, and you are done with the resetting. 

Q.3 How do I clean up QuickBooks files?

Usually, people delete all the historical data to clean the QuickBooks files. But the right way is as follows:

  • Open the file menu and click on utilities; here, you can see an option for cleaning up company data. 
  • Allow the warning and get started with the process. 

When you are done with the above steps, you can proceed with the second cleanup. Well, the second cleanup is the cleanup of Windows.

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