Guides
macOS
Guides
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How to set up SSH keys
Replace passwords with a key pair, log in without typing a password, and then switch password login off for good.
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How to connect to a server with SSH
Open a secure command line on a remote server from Windows, macOS or Linux, and understand the host key prompt you see the first…
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How to flush your DNS cache
Make your computer forget old DNS answers after a site move or record change. Commands for Windows, macOS, Linux and every major browser.
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How to fix DNS_PROBE_FINISHED_NXDOMAIN
The browser asked DNS for the site’s address and was told the name does not exist. Check the spelling, your own DNS, then the…