K by Koro https://www.korollc.com/blog/ Field notes on web infrastructure, DNS, and security from Koro LLC. en-us Sat, 04 Jul 2026 01:49:20 GMT DNS_PROBE_FINISHED_NXDOMAIN: When Your Two Nameservers Disagree https://www.korollc.com/blog/dns-nxdomain-split-authority/ https://www.korollc.com/blog/dns-nxdomain-split-authority/ Mon, 01 Jun 2026 00:00:00 GMT DNS Web Infrastructure Debugging