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Security · Services & Applications

Fix Certbot AuthorizationError and failed ACME challenges

Diagnose Certbot AuthorizationError and failed ACME challenges without retrying blindly. Separate public DNS, IPv6, HTTP-01 routing, redirects, CAA, DNSSEC, DNS-01 propagation, and multi-origin failures before issuing or renewing a certificate.
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caution75 minintermediate11 stepsUbuntu Server

Web & Proxy · Security

Configure an Nginx reverse proxy with TLS renewal

Proxy an HTTP application through Nginx, preserve client metadata, obtain a certificate, and test renewal.
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caution45 minintermediate8 stepsUbuntu Server