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Last active August 4, 2018 10:45
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Tips for dealing with DNS issues in OS X Yosemite
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DNS_tips.md

If you are having issues with DNS in OS X Yosemite, you're not alone. Me too.

Here's some background.

A less intense fix for the problems (that generally works for me) comes from these two articles on SE:

DNS doesn't work properly in OS X Yosemite
Yosemite Cannot Resolve Domain Names

Solution summary:

  • Flush DNS caches
sudo discoveryutil udnsflushcaches
sudo discoveryutil mdnsflushcache
  • Unload/reload discovery daemon (discoveryd replaces mdnsresponder)
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist

If that doesn't work, then:

  • Backup and then delete the contents of /Library/Preferences/SystemConfiguration/
  • You will have to reconfigure your network interfaces in the network control panel
  • As suggested here on the Apple forums
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