https://merlonix.com/blog/dnssec-fails-closed/
DNSSEC Fails Closed: A Broken Signature Is a SERVFAIL, Not a Warning · Merlonix
Aug 25, 2026 - Most security controls fail open — break them and traffic still flows, just unprotected. DNSSEC is the opposite. A broken signature, an expired RRSIG, or a DS...
fails closeddnssecbrokensignaturewarning