The DNS cache on MacOS Mojave needs to be cleared. Here’s how:
- Using your preferred method, run terminal.app. It can be launched from Applications>Utilities or by pressing Command+Space to launch Spotlight and search for “Terminal”.
- Type in “sudo killall -HUP mDNSResponder” and hit Return on your keyboard.
- Enter the Administrator password for the account in question and hit Return on your keyboard
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