Axelspire helps engineering and security teams eliminate certificate-driven outages through enterprise PKI automation and infrastructure intelligence — founded by Dan Cvrcek, PKI architect, applied cryptographer, CISO level consultant focusing on efficient operations of technology solutions. He has 20+ years experience at Barclays, Deutsche Bank, TSB Bank, Sky UK, Comcast, and others.

Welcome to our technical knowledge base covering certificate lifecycle management, ACME automation, and post-quantum migration.

Tag: dns-validation

All PKI knowledge base pages tagged with "dns-validation".

1 page tagged with dns-validation

Certbot DNS-01 Challenge: Wildcard Certificates & TXT Record Setup (2026) — Complete DNS-01 guide for Certbot: wildcard + multi-domain certs, exact _acme-challenge TXT record setup, rate-limit fixes, credential security, and troubleshooting that actually works in production.

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