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How to Fix Avast Firewall Blocking QuickBooks Desktop Issue?

Avast Firewall Blocking QuickBooks

Is the Avast firewall causing a hindrance to your QuickBooks Desktop? Don’t worry! This article provides comprehensive details to resolve the problem of Avast firewall blocking QuickBooks.

When facing this issue, you may encounter error messages such as “Network diagnostics failed” or “Disable exceptions firewall not defined.” These messages suggest potential connectivity issues or device security problems restricting the network between the Internet and QuickBooks. Tackling the challenge of Avast firewall blocking QuickBooks is crucial for ensuring the smooth operation of your accounting software. Whether you’ve encountered error messages or disruptions, our detailed solutions will help you navigate and fix this issue.

Let’s get your QuickBooks back on track for uninterrupted financial management.

What are the Factors that Lead Avast Firewall to Block QuickBooks Desktop?

The Avast Firewall blocking QuickBooks issue can arise due to several reasons, including:

1. Network Connectivity Problems:

Poor or inconsistent network connections may cause the Avast Firewall to block QuickBooks, obstructing the program’s ability to communicate between the software and the Internet.

2. Firewall Configuration Settings:

When QuickBooks can’t access the necessary network resources, Avast may block it due to firewall settings that are restrictive or incorrect.

3. Software Conflicts:

Avast Firewall may block QuickBooks’ functionality due to conflicts with other security software or applications installed on the system.

4. Outdated Software Versions:

Compatibility problems may arise from using out-of-date versions of Avast or QuickBooks, which could result in the firewall blocking QuickBooks.

5. Closed Ports: 

This issue arises when the computer refuses to accept the particular ports that the internet access application needs to be connected to. The user must grant access to the specific ports that the application uses to guarantee that it runs without hiccups. Unlike other apps, QuickBooks usually uses a port that is specific to the version of the application that is being accessed.

6. Avast Firewall Blocking:

The Avast firewall may prevent the application from running. A third-party antivirus program may also permanently block the application.

Now that you understand the issue and its components well, let’s proceed with resolving it.

Also Read:- How to Configure QuickBooks Firewall while for Multi-User Environment in QuickBooks?

Solutions to Fix Avast Firewall Blocking QuickBooks Issues

Solution 1: Configuration of Firewall Ports

Configuring firewall ports is essential to enable the application’s internet access. Automatic configuration can be achieved by downloading and installing the specific application. Alternatively, if manual configuration is preferred, follow the steps mentioned below:

  1. Open QuickBooks Database Server Manager
  2. Navigate to the Port Monitor tab and click on the Port Monitor.
  3. Note the Port Number listed for the application.
  4. Open settings by pressing Windows + I, then go to Update & Security and select the Windows Security tab.
  5. Click on Firewall and Network Security, then use the Firewall and network protection settings.
  6. Choose the Advanced Settings button.
  7. In the new window, click on Inbound Rules, then choose New Rule.
  8. Select Port and click Next.
  9. Choose TCP and check the Specified Local Ports option.
  10. Port numbers vary based on the accessed version.
  11. Hit Next and choose Allow the Connection.
  12. Click Next, ensuring you check all three options and add a Name for the new rule.
  13. Press on Next, and after naming, select Finish.
  14. For the Outbound Rule, repeat the process. Verify the status of the issue.

Also Read:- How to Add QuickBooks Firewall Ports Manually?

Solution 2: Adding a Firewall Exception

Make sure the Windows Firewall does not completely block the QuickBooks program, even if there are open ports. This is especially important when the program is configured as an exception. 

 Follow these steps to establish QuickBooks as an exception to the Avast firewall:

  1. Press Windows + I to open settings, then select Update and Security.
  2. Go to the Windows Security tab on the left side of the page and click on Firewall and Network Security.
  3. Choose the Advanced Settings button from the provided list.
  4. In the new screen, click on Inbound Rules, then select New Rule.
  5. Click on Inbound Rule, and hit New Rule.
  6. Select Program and click Next.
  7. Check the option This Program Path, and click Browse.
  8. Choose the path where the specific QuickBooks Program is installed.
  9. Press Next after selecting the path. Check the option Allow the Connection.
  10. Check all three given options and press Next.
  11. Enter a name for the rule and press Finish.
  12. Repeat the entire process for the Outbound Rule. Verify the status of the issue.
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Initiate a Windows Restart

Whether you’ve followed solution 1 or solution 2, it’s crucial to perform a restart afterward.

  1. Click on the Start menu.
  2. Press the Power button.
  3. Select the Restart option.
  4. Wait for the restart to complete.
  5. Once the restart is done, you’re ready to proceed with your tasks.


In conclusion, addressing the Avast firewall blocking QuickBooks Desktop issue involves a systematic approach outlined in this article. We trust that you’ve gained a comprehensive understanding of resolving this issue. By following the provided steps, you can resolve the compatibility challenges between Avast Firewall and QuickBooks, ensuring smooth and uninterrupted access to your financial software. Remember to adapt these solutions to your specific situation, and don’t hesitate to seek further assistance from our QuickBooks Desktop Assistants at our Toll-Free number: +1-855-875-1223 or mail us at [email protected].   

Frequently Asked Questions

What are the different Quickbooks Connectivity Error Codes?

Follow the list mentioned below:

H505, H202, H303, H101

Is updating Avast software or Quickbooks a potential solution?

Yes, maintaining both Avast Firewall and QuickBooks up to date can resolve compatibility issues causing blocks.

What are the common symptoms of Avast Firewall blocking QuickBooks?

Common symptoms may include QuickBooks connectivity errors, slow performance, or outright blocking of the application.

Can I resolve the issue by simply turning off Avast Firewall?

While temporarily disabling the firewall for testing purposes is permitted, it’s not an advised long-term solution for security reasons.

About The Author

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Editorial Team

At QAsolved, we are a team of skilled professionals dedicated to delivering unparalleled accounting and bookkeeping services. With backgrounds in finance and technology, our collaborative efforts focus on providing practical solutions and guidance. Our services are tailored for a range of businesses, covering advisory, CFO services, bookkeeping, and financial systems consulting. QAsolved is an award-winning consulting firm and Intuit’s #1 QuickBooks Reseller Partner. We offer comprehensive QuickBooks services, including consulting, integration, migration, maintenance, data conversion, training, and support, among other services. Over the years, we have assisted over 30K customers across various industries with their Intuit products.

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