NET::ERR_CERT_DATE_INVALID – what to do?

Certificate expired. Re-issue Let's Encrypt in panel or check auto-renewal. Clear browser cache.

Cloudflare SSL error 525/526?

525 = origin has no SSL → Cloudflare Full (strict) + Let's Encrypt on server. 526 = invalid origin certificate.

Mixed content – HTTP resources on HTTPS page. Browser console (F12) → fix mixed content warnings.

Quick answer: Fix SSL errors with a valid Let's Encrypt certificate, correct Cloudflare SSL mode (Full strict) and no mixed content.

If you landed here: Browser warns "Your connection is not private", Cloudflare shows 525/526 or padlock missing.

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