Kaspersky Internet Security is blocking Chromium-based browsers with ERR_CONNECTION_RESET

[junforever]

Problem description:

Hello Kaspersky Support Team,

I would like to report a critical issue with Kaspersky Internet Security on Windows 11. Since yesterday, Chromium-based browsers have stopped browsing the Internet correctly while Kaspersky is active.

The issue affects both Google Chrome and Brave. Windows shows that my laptop is connected to the Internet and has Internet access, but when I try to open websites from these browsers, the pages either keep loading indefinitely or fail with the following error:

ERR_CONNECTION_RESET

The browser console also shows multiple connection-related errors, such as:

net::ERR_CONNECTION_RESET

The clearest case happened with Brave. I installed Brave from scratch to rule out a corrupted Chrome installation or Chrome user profile. Brave worked normally for a few minutes after installation, but then it started failing exactly like Google Chrome. This allowed me to rule out Chrome-specific corruption as the cause.

Other browsers that are not affected by this issue can browse the Internet normally on the same laptop and using the same Internet connection.

Before confirming that the issue is related to Kaspersky, I tried the following troubleshooting steps:

• Fully reinstalled Google Chrome.

• Installed Brave from scratch.

• Tested with new browser profiles.

• Confirmed that no proxy is enabled in Windows.

• Tested with dynamic DNS settings. Previously, when the issue started, I was using Google DNS: 8.8.8.8 and 8.8.4.4.

• Disabled Secure DNS in the browsers.

• Disabled QUIC/HTTP3 in Chrome and Brave.

• Tested with IPv6 disabled.

• Flushed DNS cache and reset Windows network settings.

• Scanned the computer for malware.

• Tried changing Kaspersky encrypted connection scanning settings.

• Temporarily disabled Kaspersky protection from its settings, but the issue persisted.

The problem was resolved only when I completely turned off Kaspersky Internet Security. After fully turning off Kaspersky, Brave immediately started browsing normally again.

This strongly suggests that one of Kaspersky’s components, services, network filters, HTTPS inspection features, firewall modules, web protection modules, or internal drivers is interfering with Chromium-based browser connections and causing ERR_CONNECTION_RESET.

I do not want to browse without antivirus protection enabled, so I need help identifying exactly which Kaspersky component is causing this issue and how to fix it without fully disabling Kaspersky Internet Security.

I am attaching screenshots showing the issue in Brave, including:

• A browser page failing with ERR_CONNECTION_RESET.

• The browser console showing multiple connection reset errors.

• YouTube showing a “Connect to the Internet” message even though the Internet connection works correctly in other browsers.

Additional information:

• Operating system: Windows 11.

• Affected product: Kaspersky Internet Security v 21.3.10.391.

• Affected browsers: Google Chrome and Brave last versions.

• Error type: ERR_CONNECTION_RESET.

• Internet works correctly in other browsers (I used perplexity comet ).

• The issue disappears only when Kaspersky Internet Security is completely turned off.

• The issue started suddenly yesterday.

• I have used Google Chrome together with Kaspersky for years without this problem, so I suspect it may have been caused by a recent update to Kaspersky, its protection modules/databases, Windows, or Chromium.

Please provide specific instructions to fix this issue without having to completely disable Kaspersky, or confirm whether there is a known issue, patch, update, or recommended configuration to resolve this incompatibility with Chromium-based browsers.

Thank you.

[harlan4096]

Welcome to Kaspersky Community.

 

Update your KIS to K. Standard:

 

https://forum.kaspersky.com/topic/kaspersky-basic-standard-plus-premium-info-faq-22816/#comment-98356

[AlexeyK]

6 часов назад, junforever сказал:

Please provide specific instructions to fix this issue without having to completely disable Kaspersky, or confirm whether there is a known issue, patch, update, or recommended configuration to resolve this incompatibility with Chromium-based browsers.

Wow, what an impressive research. Well done. 🙂 But you didn't try to reinstall KIS without saving settings, that would also temporarily solve the problem.

This is a known issue with obsolete versions of the products (KIS, KTS), when some apps are blocked from the network access. Upgrading to K. Standard is the best way of fixing.

[junforever]

Thanks guys it worked now with the K standar vesion