How does a firewall affect the Cloudflare SSL handshake?

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Grade: Education Subject: Support
How does a firewall affect the Cloudflare SSL handshake?
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Firewalls can interfere with the handshake by blocking necessary TLS protocols (like TLS 1.2 or 1.3). Ensure that your firewall rules allow traffic on ports 443 and any required TLS protocols. Also, double-check that your firewall isn't inadvertently blocking Cloudflare's IP addresses or DNS servers.