What server logs should I check when diagnosing a 525 error?

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Grade: Education Subject: Support
What server logs should I check when diagnosing a 525 error?
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Check your web server's error logs (e.g., Apache's error.log, Nginx's error.log) and SSL logs. These logs often contain detailed information about the SSL handshake failure, including specific error messages related to certificate validation, cipher suite negotiation, or protocol version mismatches. Also, check any firewall logs for blocked connections from Cloudflare IPs.