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A failed DNS lookup can stay cached after the record is fixed
A newly created DNS record can still appear absent because a resolver cached an earlier negative answer. Learn what to check before changing it again.
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Practical Computing
Clock correction can happen by a jump or a gradual adjustment
Clock synchronisation can correct time by stepping or slewing. Understand the difference and why timestamps may need context when troubleshooting.
Practical Computing
An ICC display profile describes colour behaviour rather than upgrading the screen
Understand what an ICC display profile contributes to colour management, then check the monitor, profile source, and application before changing screen settings.
Software and Security
Certificate pinning trades flexibility for a narrower trust decision
Certificate pinning adds a narrower trust check to an app connection. Learn why certificate changes and recovery plans matter as much as the pin.
Everyday Digital Security
HSTS helps a browser remember that a site should use HTTPS
HSTS tells a browser to keep using HTTPS for a site. Understand its remembered policy, certificate behaviour and the limits of a secure-connection signal.
Everyday Digital Security
A password-protected archive can still contain a dangerous file
A password protects an archive’s contents from casual access; it does not prove the files are safe. Handle unexpected encrypted attachments with care.