Avast Firewall Blocking Sage 50

Updated On: October 30, 2025 9:23 am

Avast antivirus can sometimes impact the efficiency of Sage 50 accounting software. When an antivirus application flags a Sage 50 process or a file as a threat, it stops it from running. This makes the software less responsive or unreliable, and the issue can only be resolved by setting up the antivirus properly.

Correct antivirus setup guarantees the smooth running of the Sage 50 accounts. This happens mainly when the user is accessing data via the Sage Remote Data Access. Antivirus programs like Avast can stop Sage 50 processes or files, resulting in an interruption in workflow efficiency.

In this guide, complete information on the issue of Avast Firewall blocking Sage 50 has been shared. This guide explains why Avast blocks Sage 50 and how it can be fixed with ease.

Why does avast antivirus block the Sage 50 software application?

Avast antivirus blocks the Sage 50 application when certain setups are not configured properly. This leads to connection or performance problems.

Here is the list of the key reasons why Avast antivirus often blocks the Sage 50 software application:

• Wrong setup

When the antivirus program is not prepared to operate with Sage 50 Accounts, issues arise. This delays performance or restricts Sage 50 processes.

• Wrong Installation Procedure

When the antivirus security is running while installing the Sage 50 Accounts, it restricts crucial files. This leads to partial installation or inconsistent system performance.

• No IT Assistance

Often, users change antivirus settings without IT assistance. This usually results in inaccurate modifications, preventing Sage 50 from working systematically. Sage support cannot modify antivirus settings due to the advanced software structure and continuous updates.

• Connection Issues

When the firewall settings are wrongly set up, Sage 50 consistently shows “No Internet Connection” issues. This happens while accessing the Connected Services like Remote Data Access (RDA). Changing RDA does not resolve the issue till the firewall and antivirus settings are rectified.

Note: AVG, Trend Micro, Avast, Bitdefender, and Windows Defender restrict the Sage 50 program. This happens due to restricted folder access, ransomware security, or strict firewall regulations.

What symptoms indicate that avast antivirus is blocking Sage 50?

The following symptoms indicate that Avast is disrupting the Sage 50 operations. Here are the signs that indicate Avast is interfering with Sage 50 performance:

• “Sage 50 stops working” issue

This arises when the antivirus program stops Sage 50 processes. 

• Failed to find the Company File error.

This arises when the antivirus application restricts access to the shared data folder or company file. 

• Multi-user Connection Issues

In a shared network environment, users often get disconnected without any alert.

• Sudden Crashes or Freezes

While accessing the Sage 50 application may shut down or stop reacting.

• Poor Performance

The software becomes slow and unreliable, and the file opens after a long time.

Also Read: How to Fix Sage 50 Network Issues?

How to whitelist Sage 50 in avast and other antivirus firewalls?

Here are the steps to enable Sage 50 via various antivirus firewalls and regain workflow efficiency:

• AVG / Avast Internet Security

Here are the steps to whitelist Sage 50 in Avast Internet Security:

1. Click the “Menu” option.
2. Now, click the “Settings” option and then the “General” tab.
3. Now, click the “Blocked & Allowed Apps” option.
4. Erase Sage 50 from the list of “Blocked Apps”.
5. Include this executable in the list of approved programs:

• C:\Program Files (x86)\Sage 50 [version]\Sage50Accounting.exe

1. Head to the “Full Protection” option and click “Ransomware Protection”.
2. Under the “File Types” section, clear the checkboxes for Database files and Document files.
3. Click the “Allow App” option when the following notification appears:

• “Sage50Accounting.exe is trying to change or delete the file…”
  

• Bitdefender

Here are the steps to whitelist Sage 50 in Bitdefender antivirus:

1. Open the “View Features” section.
2. Now, click the “Sage Files” option and then the “Protected Folders”.
3. From the protected list, erase Public Documents and Documents.
4. For seamless access, keep Sage 50 data in a folder directly under the C:\ drive.

• Trend Micro

Here are the steps to whitelist Sage 50 in Trend Micro antivirus:

1. Certain versions comprise a Firewall Booster that interrupts Sage 50 data transfer.
2. Head to Settings and clear the checkbox for “Activate the Firewall Booster”.
3. As another option, to whitelist all Sage 50 ports, get in touch with “Trend Micro Support.

• Windows Defender

Here are the steps to whitelist Sage 50 in Windows Defender:

1. In Windows 10 or 11, look for “Virus and Threat Protection”. 
2. Now, click “Manage Controlled Folder Access”.
3. Click the “Allow an app via Controlled Folder Access”.
4. Next, click “Add an Allowed app”.
5. Include the following executables:

• C:\Program Files (x86)\Sage 50 [version]\Sage50Accounting.exe
• C:\Program Files (x86)\winsim\ConnectionManager\SimplyConnectionManager.exe
• C:\Program Files (x86)\winsim\ConnectionManager\MySqlBinary\[version]\mysqld.exe

These steps guarantee that Sage 50 runs seamlessly. No more blockage by firewall or antivirus protection.

Additional solutions and troubleshooting tips

Implement these steps to resolve installation errors triggered by leftover files or antivirus interruption:

1. Remove all the ODBC connectors.
2. Start Microsoft FixIt to erase Sage 50 leftovers.
3. Erase the following folders:

• C:\Program Files (x86)\Sage 50 Accounting 20xx
• C:\Program Files (x86)\Winsim

1. Restart the system.
2. Uninstall Avast or AVG temporarily in case the issue persists.
3. Erase hidden antivirus folders like:

• $AVG (for AVG)
• $AV_ASW (for Avast)

1. Install Sage 50 again with the installation found in:

• C:\Users\Public\Documents\Sage Software\Simply Accounting\Download

Note: Implementing these troubleshooting steps will help to fix installation issues. Once the issues are resolved, unavailable Sage 50 files impacted due to antivirus protection will be restored.

How to avoid future conflicts between avast antivirus and the Sage 50 program?

Here are the best practices to ensure Sage 50 consistent performance in the long run and avoid future interruptions:

• Allow AVG or Avast antivirus; only Sage 50’s verification is done. Ensure to verify that Sage 50 works properly post-configuration or installation.
• Ensure that the antivirus and Sage 50 application are updated to their current version.
• Daily back up company data in a separate folder like C:\Sage Data.
• Ensure not to use cleanup tools like AVG PC TuneUp, Avast Cleanup, or TuneUp utilities. Use them only when Sage 50 folders are excluded.
• Check the Antivirus “Allowed Apps” list. This will help to verify that Sage 50 is still whitelisted. 

Final Words

Avast Firewall stops Sage 50 from using the database or network, resulting in performance issues. Whitelisting Sage 50 programs and ports ensures reliable communication and prevents system inconsistencies. In this guide, complete information on Avast Firewall blocking Sage 50 has been shared. Still, if there is any query or doubt, feel free to call us. Talk to our Sage experts at +1-800-964-3096 and resolve your antivirus query with ease. 

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