Referenced from: https://support.apple.com/en-us/HT201255 To use any of these key combinations, press and hold the keys
Read more →Chrome: go to: chrome://net-internals/#dns and click "Clear host cache" Mac OS: sudo dscacheutil -flushcache; \ sudo killall
Read more →Basic getting started guide to get you going with your Yubikey and gpg.
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