Hi all,

After losing access to my router WireGuard VPN configuration, I've been trying to use the VPN app to connect to the new servers and since starting to use the app, I've been having problems while connecting to the official valve CS2 servers.

Here are the initial ping measurements right after launching the game;

Even i try to refresh the ping measurements, i get no servers other than Chinese ones. And this is what happens when i try to queue for a match:

The only exception to this is when I connect to the Estonian VPN servers. I can play the game on Estonian servers without any problems whatsoever. However, on any other server location, the game cannot ping the official servers via UDP, and fails to put me into a match.

The weird part is that when i try to ping the Valve servers themselves using ICMP protocol, replies arrive normally as expected. As example, here are the results after i try to ping Valve's Stockholm and Frankfurt servers over the same VPN connection that gives me errors;

So, as far as i can tell, the VPN servers somehow block the incoming or outgoing CS2 UDP packets. There are also problems with CS 1.6 servers for some reason. When I try to join some public CS 1.6 servers that i like to regularly play on, i can get in the game, but after like 10 seconds i start to get packet drops and the game starts to act very weird. The HUD elements such as my crosshair, remaining health and ammo, and the kill feed just disappear and after another 20-30 seconds the game kicks me out with messages such as 'Reliable channel overflowed' or 'Unable to connect to Steam'.

I usually get the 'Reliable channel overflowed' error rather than this one, and these errors DO NOT occur when I'm not connected to the VPN, or when I'm connected to the Estonian servers. Long story short, something is seemingly very off and needs to get fixed. I can also perform further tests if needed.

Thanks a lot in advance.

Edited April 4Apr 4 by undead_skeleton
fix typo

Welcome to Kaspersky Community,

 

Your best bet is to report the issue to K. Support

On 4/4/2026 at 4:59 AM, undead_skeleton said:

Hi all,

After losing access to my router WireGuard VPN configuration, I've been trying to use the VPN app to connect to the new servers and since starting to use the app, I've been having problems while connecting to the official valve CS2 servers.

Here are the initial ping measurements right after launching the game;

Even i try to refresh the ping measurements, i get no servers other than Chinese ones. And this is what happens when i try to queue for a match:

The only exception to this is when I connect to the Estonian VPN servers. I can play the game on Estonian servers without any problems whatsoever. However, on any other server location, the game cannot ping the official servers via UDP, and fails to put me into a match.

The weird part is that when i try to ping the Valve servers themselves using ICMP protocol, replies arrive normally as expected. As example, here are the results after i try to ping Valve's Stockholm and Frankfurt servers over the same VPN connection that gives me errors;

So, as far as i can tell, the VPN servers somehow block the incoming or outgoing CS2 UDP packets. There are also problems with CS 1.6 servers for some reason. When I try to join some public CS 1.6 servers that i like to regularly play on, i can get in the game, but after like 10 seconds i start to get packet drops and the game starts to act very weird. The HUD elements such as my crosshair, remaining health and ammo, and the kill feed just disappear and after another 20-30 seconds the game kicks me out with messages such as 'Reliable channel overflowed' or 'Unable to connect to Steam'.

I usually get the 'Reliable channel overflowed' error rather than this one, and these errors DO NOT occur when I'm not connected to the VPN, or when I'm connected to the Estonian servers. Long story short, something is seemingly very off and needs to get fixed. I can also perform further tests if needed.

Thanks a lot in advance.

i've been having problems with Deadlock (new Valve game) since january.
Those problems only happen with kaspersky vpn ON. But now its worse because the game cannot connect to any servers properly now.