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Fix SSL Errors – NET::ERR_CERT, Mixed Content & Cloudflare

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.

Error → fix

ErrorCauseFix
NET::ERR_CERT_DATE_INVALIDCertificate expiredRenew Let's Encrypt in panel
Cloudflare 525Origin without HTTPSSSL on server + CF Full
Mixed contenthttp:// resourcesChange URLs to https://

Setup: Set up SSL · Cloudflare DNS

Frequently asked questions (FAQ)

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.
No padlock despite HTTPS?
Mixed content – HTTP resources on HTTPS page. Browser console (F12) → fix mixed content warnings.

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