"Your connection is not private"
The browser couldn't verify your site's certificate: it's expired, for the wrong domain, or not trusted. Fix or renew it on your server.
SSL certificate expired
Renew the certificate on your server or hosting panel, then fix whatever stopped the automatic renewal so it doesn't happen again in 90 days.
HTTPS not working
Usually no valid certificate, port 443 closed, or two redirect settings fighting. Check the certificate, then redirects and Cloudflare SSL mode.
SSL handshake failed
Your server and the browser or Cloudflare couldn't agree on a secure connection: no certificate, wrong SSL mode, or outdated TLS only.
Mixed content error
Your secure (HTTPS) page loads some files over insecure HTTP. Browsers block them or drop the padlock. Change those links to HTTPS.
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