Tag: troubleshooting
All PKI knowledge base pages tagged with "troubleshooting".
- Apache Diagnostic Commands: apachectl, Virtual Hosts & SSL Configuration — Complete Apache command reference for certificate operations. apachectl -S, configtest, -M commands for virtual host analysis, SSL troubleshooting, and ACME validation.
- Apache Diagnostics for ACME: Fix HTTP-01 Challenge & SSL Certificate Errors — Diagnose Apache virtual host conflicts, 404 challenge errors, and SSL certificate issues. Essential apachectl commands for troubleshooting Let's Encrypt HTTP-01 failures.
- Certbot Version Check: Commands & Usage — Commands to check Certbot versions across snap, pip, and system installs—verify ACMEv2 and ARI (4.1.0+) compliance, resolve conflicts, and automate fleet auditing.
- Certificate Expiry Outage Response: Emergency Runbook & Prevention — Respond to certificate outage and expired-certificate incidents. Emergency runbook, triage, renewal failure handling (including Certbot renew exit codes), and prevention so expiry outages don't recur.
- Fix Certificate Chain Validation Errors 2026: partialchain, unable to get issuer — Step-by-step fix for “chain validation failed”, “partialchain”, and “unable to get local issuer certificate”. Common causes + exact commands for OpenSSL, curl, Java, and browsers.
- HTTP-01 Challenge Errors: Fixing 404, Timeout & Validation Failures — Solve ACME HTTP-01 challenge failures. Debug 404 errors, firewall blocks, reverse proxy issues, and .well-known/acme-challenge configuration problems.
- Let's Encrypt Rate Limits: Errors, Workarounds & Reset Times — Fix Let's Encrypt rate limit errors. Current limits explained, how to check remaining quota, staging environment testing, and strategies to avoid hitting limits.
- PKI Performance Bottlenecks: Scaling at Scale, Vault High Concurrency & Certificate Rotation — Fix certificate operations that slow down at scale. Serial CA calls, OCSP overload, HSM limits—and scaling HashiCorp Vault for CI/CD high concurrency and certificate rotation at scale.
- Top 20 PKI Misconfigurations: HTTP-01 404, SAN, Permissions & ACME Challenge Fixes — Fix 'wrong status code 404 expected 200' HTTP-01 challenge, common Certbot DNS-01 errors, SAN and permission mistakes. The misconfigurations that cause 80% of certificate outages—with detection and fixes.