Sometimes, Thunderbird may give an error stating that the connection to the server has been reset. You may don’t know how to fix the issue. Don’t worry. This post from MiniTool provides multiple methods to get rid of the “Thunderbird connection to server was reset” issue.

Some Thunderbird users occasionally receive a "connection has been reset" error after their email client cannot connect to the email client. Gmail usually reports this issue. The following are some possible reasons:

  • Avast’s Mail Shield is blocking.
  • AVG Shield is blocking.
  • You are using the modified version of Thunderbird.

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Now, let’s see how to fix the Thunderbird connection to server was reset issue.

Fix 1: Turn off Mail Shield in Avast

One of the most common culprits for this “Thunderbird connection to server was reset” problem is the mail scanning feature called Mail Shield on Avast. Thus, it’s recommended to turn off it. Here is how to do that:

Step 1: Open Avast and click the Menu icon (on the top-right side of the software interface).

Step 2: Then, you need to click Settings to continue. On the next interface, you need to go to Protection > Core Shields.

Step 3: Then, find the Mail Shield component, uncheck the box associated with Enable Mail Shield and then click Stop permanently to disable it.

Step 4: Click OK to save the changes.

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Fix 2: Turn off VPN and Proxies

It’s recommended to turn off VPN ad proxies to fix the “Thunderbird connection to server reset” error. Here is how to do that.

Step 1: Open the Settings application by pressing the Windows + keys at the same time.

Step 2: Then, click the Network & Internet part to open it.

Step 3: Click the Proxy tab and turn off the Use a proxy server option.

After that, check if the error Thunderbird connection to server was reset has gone.

Fix 3: Reinstall AVG

If the last solution fails to resolve the problem, you may have to reinstall AVG. Here is how to do that.

Step 1: Right-click the Start menu and select Programs and Features (Apps and Features) from the context menu.

Step 2: In the pop-up window, find the AVG program, right-click it and select Uninstall. Then follow the on-screen prompts to complete this process.

Step 3: Restart your PC to take its effect. After that, you can download this software from its official website. After reinstalling the software, launch it and see if the issue is gone.

Fix 4: Turn off Antivirus Software Temporarily

The antivirus software can cause the “Thunderbird connection to server was reset” error. Thus, you need to turn off Windows Defender Firewall and third-party antivirus software temporarily.

Now, let’s see how to turn off Windows Defender Firewall.

Step 1: Open the Run application on Windows and input firewall.cpl, then click OK to open Windows Defender Firewall.

Step 2: Click Turn Windows Defender Firewall on or off to open the Customize Settings.

Step 3: Choose both the Turn off Windows Defender Firewall(not recommended) options and press the OK button.

turn off Windows Firewall

Then you need to disable third-party antivirus software, like Avast. Follow this post - Best Ways to Disable Avast for PC and Mac Temporarily/Completely to disable it.

Tip: It is recommended to open the antivirus software again after solving the problem to protect your computer.

Final Words

How to fix Thunderbird connection to server was reset? This post has shown 4 reliable solutions. If you have come across the same error, try these solutions. If you have any better ideas to fix it, you can share it in the comment zone.

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