Check DNS delegation chain integrity, nameserver consistency, SOA records, and DNSSEC configuration. Diagnose why DNS changes might not be propagating.

A broken DNSSEC chain of trust means the DS record published at the parent zone does not match the DNSKEY record at your zone, or no DS record exists despite DNSSEC being enabled. Validating resolvers like Google Public DNS and Cloudflare 1.1.1.1 return SERVFAIL for your domain, causing resolution failures.

When a domain expires, its DNS records stop resolving. MX records vanish, email bounces, websites go offline, and authentication breaks. Recovery is possible during the grace and redemption periods, but fees increase and time is limited. This guide covers how to diagnose, recover, and prevent domain expiry.

DNSSEC RRSIG signatures have a fixed validity period. When they expire, validating resolvers like Google Public DNS and Cloudflare 1.1.1.1 treat the zone as bogus and return SERVFAIL. This is a time-bomb failure: everything works until expiration, then all resolution breaks at once.

A domain expiry warning means your domain's registration period is ending soon. While auto-renewal handles most cases, failed payments, locked accounts, and bounced billing emails cause domains to lapse every day. This guide covers what to check at each urgency level — from 90 days out to 7 days before expiry.

DNSSEC adds cryptographic signatures to DNS responses, letting validating resolvers confirm that answers have not been tampered with in transit. This guide covers the chain of trust, key types, how to enable signing, common failures, and how to verify your setup.