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Analysis of the GFW's Unconditional Port 443 Block on August 20, 2025

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Analysis of the GFW's Unconditional Port 443 Block on August 20, 2025

The Great Firewall of China (GFW) conducted a large-scale, unconditional block targeting TCP port 443 on August 20, 2025. This report documents the measurements and analysis we conducted of that event.

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