Dev Tools · 2h ago
Debugging HTTPS Failures: How ACME Validation Works
A developer debugging HTTPS certificate failures learned that ACME validation requires Let's Encrypt to reach the server, not just the server reaching Let's Encrypt. The root cause was a networking issue, not a TLS problem. Understanding ACME's verification process helped isolate DNS, routing, and port issues.
Meridian48 take
This is a practical debugging primer for developers using Let's Encrypt, but the core lesson—that certificate failures often expose underlying network problems—is well-known to experienced sysadmins.
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Understanding ACME: What I Learned While Debugging HTTPS Certificate Failures →
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