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Plain guides to the checks behind a healthy website: reading certificate dates before they bite, making sense of DNS and mail records, and working out whether a site is down for everyone or only for you.
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How to check an SSL certificate's expiry date, and why it is shrinkingThree ways to read a certificate's end date, what the shrinking validity limits mean, and what to do when it has already expired.Reading time: 7 min
How to read DNS records: A, MX, TXT, SPF, DMARC and CAAEvery common record type with an example line, plus SPF, DMARC and CAA rules, NXDOMAIN versus no data, and the dig commands to check them.Reading time: 7 min
Is a website down for everyone or just me? A step-by-step diagnosisRead the error, test DNS, HTTPS and the certificate, switch networks, flush your cache, and know what a single check cannot prove.Reading time: 5 min