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I know how frustrating the "CS2 unable to establish connection" error can be. Here are the solutions that fixed this issue for me and many other players. Check your internet first. Run a speed test and switch to a wired connection if you're on WiFi. A stable connection makes a big difference. The fastest fix is often to restart both CS2 and Steam. Close them completely and open them again. This fixes many temporary connection problems. If a simple restart doesn't work, try these commands in C