Recent Blog Posts
Fixing BIND9 TSIG Zone Transfer Failures & REFUSED Errors
Troubleshoot and fix BIND9 secondary zone AXFR/IXFR transfer failures caused by TSIG signature verification errors, algorithm mismatches, and clock skew.
Fix PowerDNS AXFR TSIG and Autoprimary NOTIFY Errors
Resolve PowerDNS zone transfer failures, TSIG BADSIG validation errors, and rejected NOTIFY packets from primary nameservers with production SQL fixes.
Fixing Dual-Stack IPv4/IPv6 rDNS & PTR Delegation
Resolve FCrDNS failures in dual-stack networks. Learn how to configure RFC 2317 IPv4 classless delegation and correct ip6.arpa reverse DNS zones.
Fixing SPF PermError and DKIM 2048-bit DNS Chunking Syntax
Debug SPF PermError lookup limits and fix DKIM 2048-bit public key chunking syntax across RFC-compliant DNS zone files to restore email deliverability.
Fixing DNSSEC SERVFAIL Errors on Domain Migration
Resolve DNSSEC SERVFAIL errors after domain migrations. Step-by-step guide to fixing mismatched DS records, RRSIG validation, and trust chain breaks.
Fixing DNS SERVFAIL Caused by Expired DNSSEC RRSIG Records
Diagnose and resolve DNS SERVFAIL errors caused by expired DNSSEC RRSIG records, validation mismatches, and broken trust chains.
Fix Nginx Upstream Sent Too Big Header 502 Error
Resolve Nginx 502 Bad Gateway 'upstream sent too big header' by properly configuring fastcgi_buffer_size, fastcgi_buffers, and proxy_buffer_size.
Fix DNSSEC SERVFAIL After Changing Nameservers
Website returning SERVFAIL after updating nameservers? Learn how stale DNSSEC DS records break DNS resolution and how to fix the issue in minutes.
Why Your Domain Transfer Gets Rejected Without Explanation
Domain transfer failed without explanation? Learn the hidden reasons behind rejected transfers, including locks, status flags, and ICANN restrictions.