Recent Blog Posts
eMudhra CA Key Flaw Prompts Browser Blocks, Market Exit
Eight eMudhra intermediate CAs suffered severe private key entropy loss. Learn how root stores blocked the keys and what DevOps teams must audit.
How to Diagnose and Fix DNS Lame Delegation
Detect and resolve DNS lame delegation issues where parent zone nameservers refuse queries or lack authority. Step-by-step dig diagnostics and fixes.
Fixing RFC 2317 Classless Reverse DNS Delegation
Resolve NXDOMAIN and SERVFAIL errors in classless IPv4 reverse DNS delegations. Step-by-step diagnostic workflow using dig, BIND9, and PTR validation.
Why CNAME at the Apex Fails and How Flattening Works
Understand RFC 1034 apex CNAME restrictions, how DNS flattening and ALIAS records bypass them, and how to verify resolution using dig and online tools.
Diagnosing Missing DNS Glue Records and Cyclic Loops
Learn how to detect and resolve in-bailiwick circular DNS delegation failures caused by missing or mismatched glue records using dig and root traces.
Diagnose Broken DNS Glue Records Using Dig
Learn how to detect missing or mismatched in-bailiwick DNS glue records at the parent TLD registry using dig and command-line diagnostics.
Fix DNS CNAME Coexistence Conflicts and Apex Errors
Diagnose and resolve DNS CNAME coexistence violations (RFC 1912/2181) causing NXDOMAIN, SERVFAIL, and broken MX/TXT records across resolvers.
Fixing Missing Glue Records in DNS Delegation
Resolve SERVFAIL and circular dependency resolution errors caused by missing in-bailiwick glue records in authoritative parent zone delegations.
Strict SPF, DKIM, and DMARC Syntax Architecture Guide
Master SPF lookup limits, multi-string 2048-bit DKIM TXT record splitting, and strict DMARC alignment enforcement across DNS nameservers.