How do I flush my DNS cache to potentially resolve Error 266?

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Grade: Education Subject: Support
How do I flush my DNS cache to potentially resolve Error 266?
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Flushing your DNS cache can resolve outdated DNS information that might be causing connection problems. On Windows, open Command Prompt as administrator and type `ipconfig /flushdns` then press Enter. On macOS, open Terminal and type `sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder` and press Enter (you'll need to enter your administrator password).