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.

Since approximately mid-April 2026, Kaspersky's HTTPS traffic scanning/injection is breaking Stripe.js payment iframes on merchant websites. The MITM proxy alters iframe contents, which triggers Content Security Policy violations and causes browsers to block the payment frame entirely.

  ▎ Impact: End users with Kaspersky installed cannot complete payments on sites using Stripe. Disabling only the browser extension does not help — the full Kaspersky application must be disabled.

  ▎ Root cause: Kaspersky's web protection rewrites or injects content into cross-origin iframes served from js.stripe.com / *.stripe.com, violating the CSP headers set by Stripe.

  ▎ Request: Please add *.stripe.com domains to the exclusion list for HTTPS scanning/injection, similar to how banking sites are typically excluded. Stripe is a PCI-DSS Level 1 payment processor — injecting into our payment frames creates both a security risk and a broken user experience.
 

Hello, since i updated the macbook to Sonoma, every two days or so, when i start the computer, and i go into Safari, I get the error: "A secure connection could not be established." This is because Kaspersky does not start correctly, and the 'full hard drive access' privilege is cancelled, and I have to give it access again... Why is this privilege canceled automatically? I have uninstalled Kaspersky, and reinstalled it, and the error still occurs. How can I fix it permanently? Thank you.

Castellano

Buenas, desde que actualicé el macbook a Sonoma, cada dos días o así, cuando inicio el ordenador, y me meto en Safari, me sale el error de: "No se pudo establecer una conexión segura". Esto se debe a que Kaspersky no inicia bien, y se le cancela el privilegio de 'acceso total a disco duro', y le tengo que volver a dar acceso... ¿Por qué se cancela este privilegio automáticamente? He desinstalado Kaspersky, y le he vuelto a instalar, y el error sigue ocurriéndome. ¿Cómo puedo solucionarlo definitivamente? Gracias.

I am facing a severe issue with Kaspersky's Firewall where it completely blocks or heavily throttles local P2P connections and low-latency local game streaming. Apps like Sunshine/Moonlight (local game streaming), Hamachi, and Radmin VPN (LAN emulators) cannot function properly.

The client devices can technically "handshake" and connect to the host PC, but immediately after connecting, the video stream freezes completely, or the connection experiences ridiculously high latency / packet loss, making it completely unusable.

Here is everything I have already tried to troubleshoot, which did not resolve the issue:

1. Network Properties: Changed the network adapter type from "Public" or "Local" to "Trusted Network" inside Kaspersky Firewall settings.

2. Packet Rules: Manually created Inbound/Outbound packet rules to explicitly Allow both TCP (ports 47984, 47989, 47990, 48010) and UDP (ports 47998, 47999, 48000, 48002, 48010) protocols, moving these rules to the very top of the priority list.

3. Application Rules: Added the executables (like sunshine.exe) to the "Trusted" group with unrestricted network access.

4. Local Subnet Rule: Created a broad rule to allow all TCP/UDP traffic from/to my local subnet range.

The catch: Even if I temporarily "Pause Protection" via the Kaspersky tray icon, the restriction somehow persists in the background network drivers unless Kaspersky is completely closed or uninstalled.

It seems Kaspersky's network inspection driver/filter is intercepting UDP broadcast/P2P traffic, treating high-bitrate local streams (around 50 Mbps) as a network attack or flooding, which causes massive packet drops and immediate freezing.

Has anyone found a workaround for this deep-level packet filtering issue? Are there any specific hidden settings or registry tweaks to stop Kaspersky from interfering with local high-speed UDP traffic?

Thanks in advance.

Just my thoughts. 

Step 1: Operating system and version info.

O/S Version:  Win 11 Pro v25H2 (OS Build 26200.8246)

Step 2: App name and version info.

App Name:  Kaspersky Internet Security
App Version:  21.3.10.391 (m)

Step 3:  Description of issue.

Kaspersky in the system tray keeps disappearing and trying to open the app does nothing until the entire system is rebooted/restarted.

Windows security page states "Kaspersky Internet Security is snoozed."

Event viewer states "Updated Kaspersky Internet Security status successfully to SECURITY_PRODUCT_STATE_SNOOZED." from source SecurityCentre twice in a row with the same timestamps followed by "Offline downlevel migration succeeded." from source Security-SPP approx 15 and again 16 minutes later.

The only information I've found in regard to this issue states its likely caused by Microsoft windows update and to just reinstall the app, I've done that, as a clean install with the removal tool twice now and the issue persists, restarting windows frequently is not really a solution to the problem.

Any ideas where to start? 

Postscriptum:  I should also say having exactly the same issue on a windows 11 laptop, only difference is that its win 11 home on the laptop, this situation is incredibly frustrating.

For almost a week now, Discord app was stuck on eternal 'update failed, retrying' loop whenever you tried to start it up. I tried all possible fixes available only to realize it's not an issue with Discord itself but with Kaspersky. When I turn it off, Discord updates normally and is back up and running but then breaks again after some time and loading screen spinning indefinitely when Kaspersky is enabled again.

It must've been one of the recent updates that fried it. Any ideas how to fix it? Would adding it to exemptions work? Discord seems to be installed directly in appdata but I can't seem to direct exclusion directory there.

I've gone through my reports, there's no indicators or notifications that any part of Discord app has been quarantined or removed to do this.

is there a way to set avp.exe high priority in Windows Task Manager in order to give Kaspersky Internet Security full resources while running a complete scan of a 2TB drive (without the need to make exceptions) at least once?

Kaspersky Internet Security: 21.3.10.391 (m)

Microsoft Windows 11 x64 Build 26200

does anyone has experience on wifi monitoring,

Through my wifi network, I had work from home?

any experiences?

thank you!!!!!!!!’n

I own www.flightstreamer.com and it's detected as "Malware". It used to point to a redirect to a linktr.ee profile, but now it is a safe, standalone site deployed in Digital Ocean. I tried submitting for analysis and never heard back. Please help , as it hurts my brand. Thanks!

Kirill

I use burpsuite to intercept my packets, when ever I turn on my burpsuite’s proxy and try to intercept the packets I get an error message from my kaspersky antivirus (image attached below).

If I turn off my burpsuite’s proxy to default system proxy setting I’m able to browse the internet.

Is there any solution other than disabling my antivirus while I’m intercepting?

If there is any please do share it with me.

Thanks in advance!

Cheers :)

any solution of this as i'm having concern regarding disabling the monitoring of 443 port would cause any security risks in the future?

my KIS current version: 21.3.10.391 (m)

Thanks in advance.

For your reference, I have attached a screenshot of my MacBook specifications. I kindly request your guidance on how to successfully install Kaspersky on my device.

Thank you in advance for your support.

https://addons.mozilla.org/en-US/firefox/addon/kaspersky-protection-2021/reviews/?score=1

I am having a problem similar to what Veerain described in Kaspersky Hardware virtualization error from back in May.

1)      Which Windows OS version & build?

a)      Windows 10 version 22H2, build 19045.2251

2)      Have all Windows updates & patches been applied successfully?

a)      Yes, including KB5019959 released on 11/8/2022.

3)      Which KIS version & patch(x), x=letter, is installed, on the Windows taskbar, or hidden icons, rightclick the Kaspersky icon, select About?

a)      21.3.10.391 (j)

As far as I am able to determine all of the UEFI settings for virtualization are correct, the processor (an Intel Core i7-8700K) supports virtualization, Core Isolation and Device Guard are off, Hyper-V was never installed, and I have even uninstalled VMWare Workstation Player.  I have had a couple of power outages recently, however, I do not think that would have any impact on this.  I am hoping someone can provide guidance from here.

Regards,

Matt Routt

I use the app like a portable comfyui.
I tried disabling all the antivirus modules one by one(File antivirus,Firewall,...), but nothing works; I have to completely disable the antivirus each time.

kaspersky internet security: 21.3.10.391 (m)
microsoft win 11 version 25H2
 

capture with antivirus active and inactive

Suddenly my Firefox is giving a Secure Connection Failed error.

Upon some googling from Chrome, I found that some settings/certificate issues in Kaspersky may cause this. So, I tried exiting Kaspersky Internet Security and Firefox works as usual.

I am using:

• Windows 11 Version 22H2 (OS Build 22621.2070)
• Firefox 116.0.1
• Kaspersky Internet Security 21.3.10.391 (K)

How can I fix the issue?

Thanks

Anyone can help me please, looks like  Kasp Firewall keeps blocking my spotify app in Windows 10.

I can get around it by pause Kasp protection, however every time protection resume, spotify stop working, it is so annoying.

I tried to adjust setting in Kasp.  but I am stuck.

Thanks in advance.  

Kaspersky acting like they pay to me for using their products. I'm not in control anymore. If I want to use 2015 version - I can't. Why? Because there is a guy (concerned moderator) who will say - it will be a nonsense. Why do you care mate? I paid for this product, I'll use it the way I want. If I'm not following your recommendations, I can't blame you for potential damage, but let me choose. I'm the one who is giving the money for the product, not you.

Right now I got a notification. And that was the last straw. New version will be installed on my computer. I got two options - to download and install it now or to download and install it in the background. Are you serious? Is there a question - DO you want to install new version? No? Why? Because Kaspersky pays me for using their product?

Please, how can I block a range of IP Addreses using Kaspersky Firewall? Say that I need to block a range of addreses going from XXX.0.0.0 to XXX.255.255.255.

Thanks for the help

Newer version is slow, over-bloated, filled with irremovable telemetry, unwanted intrusion in my browser and other apps.

All I use in KIS is the intrusion prevention module, I disable everything else because it never finds anything and is just slowing down the PC for no reason.

My logs have never shown any blocked intrusion by the way, does this mean I can safely uninstall KIS of do the logs not show blocked intrusion attempts?

the logs do not have any mention of a prevented intrusion or network attack

does this mean nothing was ever blocked or are attacks not logged?

windows 11 pro

my product : KIS

I dont want to see those pop up reports and notification about kaspersky has blocked such website, deleted such fraudulent email etc etc. I want Kaspersky to do his job in the background without interupting me on whatever it does.

I searched the entire setup and configuration of the app but disabling them is not an option I can find in there

Some feature can be disabled individually (such as weak WIFI password, ...) but I want to disable ALL notification/reports

Anyone find some ways to do that?

Thanks

I don't want to install new KS, because I have PC's with Vista and Windows 7.