macOS 26 silently breaks the long-standing /etc/resolver/ mechanism for custom DNS TLDs. mDNSResponder now intercepts queries for non-IANA TLDs (.internal, .test, .lan, .home.arpa) and handles them as multicast DNS, never reaching local nameservers like dnsmasq. This breaks developer workflows, Docker DNS, Tailscale, Kubernetes local dev tools, and more.
Infrastructure
macOS 26 breaks custom DNS settings including .internal
macOS 26's mDNSResponder silently intercepts custom DNS TLDs like .internal and .test, breaking developer workflows for Docker, Kubernetes, Tailscale, and local nameservers.
Thursday, March 19, 2026 12:00 PM UTC2 MIN READSOURCE: Hacker NewsBY sys://pipeline
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infrastructure