QuickBooks Error H303

QuickBooks Error h303

Errors while making use of QuickBooks can be stated to be a common occurrence. And there are many errors that you may face while using the program, which may range from issues concerning the program, the system it is installed on or even your internet connection. Among these errors, H303 is one error that emerges as a result of a failure to set up a connection with the server. There may be various reasons for the same, which have been explored below. These causes may vary from faulty files, faulty configuration settings, or even an inadequate network. So, keep reading to know more about what the error is, why it occurs and how you can resolve it when faced with error H303. Even if you are not faced with the error at this moment, keep these solutions in mind so you can easily resolve it if you do face the error in the future.

Error H303 in QuickBooks

QuickBooks error H303 is one among the range of similar errors like H101, H202, and H505. These are similar errors that occur due to the nature of QuickBooks, which allows multiple users to access the program simultaneously. This feature of the program leads to many missing components that need additional configuration in order to work properly. Multiple software failures may also trigger the error, leading to you facing difficulties in accessing company files containing any kind of additional files.

In the case of error H303, the error may emerge when the program attempts to develop a connection with the company file, leading to failure in setting up a connection with the server itself. Connection to the server is crucial, especially when multiple users are accessing the file. This also implies that you are most likely to face the issue when accessing the system remotely, and the company file is on another computer. Due to this, it is crucial for you to know how to resolve the error in order to continue to host multiple users successfully.

Root Causes of QuickBooks Error H303

As mentioned above in brief, the root causes for the error code can be due to various reasons. Ranging from damaged files, improper configuration setting, or a malfunctioning network, the real reason for you facing the issue can be multiple. Here, some of the most common reasons have been expanded and delved into. So, if you do see the error while using QuickBooks, the probability of it being due to one of these reasons is high.

Damaged .ND files

.ND (Network Data) files are configuration files that allow you to use QuickBooks and access the company file in a multi-user environment. Since multi-user configuration is essential for all related users to use the program in the intended manner, damaged .ND files can be detrimental to how you use it and maintain productivity while using the program. Resolving this is of utmost importance to continue using the program remotely and make it available and accessible to employees and associated partners.

Lack of accessibility to company files and folders hosted by server or IP address

Connection to the correct IP address is crucial when using QuickBooks. In order to access the correct company files and folders, QuickBooks needs to connect to the correct IP address to connect the server. Thus, not being able to connect to the correct server can lead to QuickBooks being unable to access the files itself. This, in turn, can lead to hindrance for the multiple users in remotely accessing the system containing the company file.

Faulty configuration settings for hosting

Configuration of the network to support multi-user hosting is a crucial requirement to keep your program suitable for efficiently hosting multiple users. Thus, faulty hosting configuration can lead to none of the users being able to use the program efficiently. Faulty configurations can lead to you or any of the other users not being able to access the company files and folders at all. Since this happens due to the server not being able to connect to the correct hosting server efficiently, resolving this promptly is crucial.

Company file communication system blocked by firewall

While a firewall is crucial to maintain the security of the system you are using in the process of exchange of data and information, it can also lead to QuickBooks not being able to communicate with the company files. Restriction of the program in being able to communicate with company files can also lead to inability of the multiple users in working on the company file. While it is one of the most common causes for getting error H303 while using the program, it can be easily resolved by modifying configurations of the firewall.

System network malfunctioning

Considering the dependence of QuickBooks to use the system network to use the program efficiently, a malfunctioning system network or an improper network can lead to the identified issues as well. This can lead to the program not being able to interact with the company file or the users not being able to interact with the file as well.

How to fix the QuickBooks Error H303

Resolving and fixing the various causes of the H303 error is considerably easy, since they pertain mainly to network settings of your computer or may need a simple change in the company file extension. However, here are 4 solutions that you may apply if you see the error H3030 appearing on your screen. You can use them as you see fit to improve the functionality of your QuickBooks.

Installing QuickBooks File Doctor

As the name suggests, QuickBooks File Doctor is a diagnostic tool for QuickBooks that helps you diagnose issues and implement remedies to correct any unexpected issues and errors. To install and run QuickBooks File Doctor, follow these steps:

  • Step 1: Check that QuickBooks is installed on the server with the correct configurations.
  • Step 2: After confirming configurations, install and run QuickBooks File Doctor to diagnose and fix the issue automatically.

In order to resolve error H303, you will need to correct the “QuickBooks Multi-User Hosting” settings when using the file doctor application.

Changing firewall authentication settings

As established above, firewall settings may be blocking QuickBooks from interacting with the company fickle efficiently. So, modifying firewall settings can be an effective solution as well. In order to do this, follow these steps:

  • Step 1: On the open window, choose the “Firewall Authentication” setting and click on “Control Panel.”
  • Step 2: In the following page, click the “Allow a program through the firewall” option.
  • Step 3: Browse through the exception list, click on “Add Programs,” and then select “Add QuickBooks 20–,” depending on your version of the application.
  • Step 4: Confirm the changes and then restart QuickBooks to apply and verify the changes.

Checking QuickBooks settings

While sometimes issues may lie in the system configurations, often the problem may be in the settings of your QuickBooks itself. So, to check and change QuickBooks settings, follow these steps:

  • Step 1: Launch QuickBooks in the multi-user mode.
  • Step 2: Select the relevant QuickBooks folder from both the systems.
  • Step 3: Click on the “File” option, click on “Utilities,” and then on “Stop Hosting Multi-user configuration.”
  • Step 4: From any of the two systems, choose “Turn on hosting.”
  • Step 5: Go to “Utilities” in the “File” option again, and click on “Host Multi-user configuration.”
  • Step 6: Close QuickBooks and open it again on both systems to confirm the changes.

Changing settings of QuickBooks files and folders

Changing the settings of the company files and folders can also help to address the issue effectively. One solution can be to change settings of the QuickBooks folder location. To do so, follow these steps:

  • Step 1: Start by creating a new folder in the desired location.
  • Step 2: Facilitate sharing of the company files by setting and accessing the window access permission.
  • Step 3: Select the .qbw folder, copy it, and paste it into the new folder you just created.

This can enable you to access the company file through multi-user mode effectively. Alternatively, if the reason is due to issues in the company file itself, you can rename the .TLG and .ND files by adding the .old extension. This will allow QuickBooks to create new files in the older format and allow you to access it efficiently.


In conclusion, it can be understood that the error can emerge as a result of issues with the system, the file or folder or even settings of QuickBooks itself. So, with the pointers presented here, you can effectively diagnose the cause of the error in your case. You can also apply the four solutions given here and you can easily resolve the issue effectively. Just keep in mind that errors are impertinent and unavoidable. So, as long as you know how to resolve the issue, you will be good to go.

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