{"id":53848,"date":"2026-11-13T14:28:34","date_gmt":"2026-11-13T19:28:34","guid":{"rendered":"https:\/\/mjtsai.com\/blog\/?p=53848"},"modified":"2026-11-13T14:28:34","modified_gmt":"2026-11-13T19:28:34","slug":"dns-resolution-failures-in-macos-26-and-27","status":"publish","type":"post","link":"https:\/\/mjtsai.com\/blog\/2026\/11\/13\/dns-resolution-failures-in-macos-26-and-27\/","title":{"rendered":"DNS Resolution Failures in macOS 26 and 27"},"content":{"rendered":"<p><a href=\"https:\/\/wadetregaskis.com\/dns-resolution-failures-in-macos-26-27\/\">Wade Tregaskis<\/a>:<\/p>\n<blockquote cite=\"https:\/\/wadetregaskis.com\/dns-resolution-failures-in-macos-26-27\/\">\n<p>Sporadically (once every week or two) on macOS 26, domain name resolution will just abruptly stop working.  But, it gets worse.  I recently updated to macOS 27.2, and now the problem occurs multiple times an hour.<\/p>\n<p>That is, name resolution fails <em>if<\/em> done through Apple&rsquo;s libraries &#x2013; through <code>dig<\/code> or <code>nslookup<\/code> it continues to work just fine, which means things like <code>ping<\/code> also work just fine, but e.g. <code>curl<\/code> and Safari do not.<\/p>\n<p>[&#8230;]<\/p>\n<p>I&rsquo;ve been seeing this issue on multiple completely independent Macs and networks for many months now &#x2013; and now, as noted, it&rsquo;s a thousand times worse in macOS 27[&#8230;]<\/p>\n<\/blockquote>\n\n<p>He has some workarounds like killing <code>configd<\/code>.<\/p>\n\n<p>Previously:<\/p>\n<ul>\n<li><a href=\"https:\/\/mjtsai.com\/blog\/2015\/06\/30\/mac-os-x-10-10-4-improves-networking-reliability\/\">Mac OS X 10.10.4 &ldquo;Improves Networking Reliability&rdquo;<\/a><\/li>\n<li><a href=\"https:\/\/mjtsai.com\/blog\/2015\/05\/27\/mac-os-x-10-10-4-replaces-discoveryd-with-mdnsresponder\/\">Mac OS X 10.10.4 Replaces discoveryd With mDNSResponder<\/a><\/li>\n<li><a href=\"https:\/\/mjtsai.com\/blog\/2015\/01\/13\/why-dns-in-os-x-10-10-is-broken\/\">Why DNS in OS X 10.10 Is Broken<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Wade Tregaskis: Sporadically (once every week or two) on macOS 26, domain name resolution will just abruptly stop working. But, it gets worse. I recently updated to macOS 27.2, and now the problem occurs multiple times an hour. That is, name resolution fails if done through Apple&rsquo;s libraries &#x2013; through dig or nslookup it continues [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"apple_news_api_created_at":"2026-11-13T19:28:38Z","apple_news_api_id":"917cf971-66af-4f71-af06-de3ded713293","apple_news_api_modified_at":"2026-11-13T19:28:38Z","apple_news_api_revision":"AAAAAAAAAAD\/\/\/\/\/\/\/\/\/\/w==","apple_news_api_share_url":"https:\/\/apple.news\/AkXz5cWavT3GvBt497XEykw","apple_news_coverimage":0,"apple_news_coverimage_caption":"","apple_news_is_hidden":false,"apple_news_is_paid":false,"apple_news_is_preview":false,"apple_news_is_sponsored":false,"apple_news_maturity_rating":"","apple_news_metadata":"\"\"","apple_news_pullquote":"","apple_news_pullquote_position":"","apple_news_slug":"","apple_news_sections":"\"\"","apple_news_suppress_video_url":false,"apple_news_use_image_component":false,"footnotes":""},"categories":[2],"tags":[131,728,30,2784,2742,476],"class_list":["post-53848","post","type-post","status-publish","format-standard","hentry","category-technology","tag-bug","tag-domain-name-system-dns","tag-mac","tag-macos-27","tag-macos-tahoe-26","tag-networking"],"apple_news_notices":[],"_links":{"self":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/53848","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/comments?post=53848"}],"version-history":[{"count":1,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/53848\/revisions"}],"predecessor-version":[{"id":53849,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/posts\/53848\/revisions\/53849"}],"wp:attachment":[{"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/media?parent=53848"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/categories?post=53848"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mjtsai.com\/blog\/wp-json\/wp\/v2\/tags?post=53848"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}