Both errors mean the connection between Cloudflare and your origin server timed out or was refused. Check that your server is actually running and not overloaded. Make sure your firewall isn't blocking Cloudflare's IP ranges — this is a common culprit. You can find the current list of Cloudflare IPs at cloudflare.com/ips and whitelist them explicitly.
If you can't get into your Cloudflare account, first rule out a stale session: clear cookies for cloudflare.com and try an incognito window. If two-factor authentication is the blocker — backup codes are your only way in without the authenticator app, so keep them somewhere safe. Account lockouts after failed attempts usually lift within 30 minutes.
Error 525 or 526 typically means the SSL certificate on your origin server is missing, expired, or self-signed when Cloudflare expects a valid one. Check your SSL/TLS mode in the dashboard — switching from Full (Strict) to Full can buy you time while you fix the cert. Never leave it on Flexible in production; it creates a false sense of security.
Deployments fail most often because of build command mismatches or environment variables that aren't set in the project settings. Double-check that your framework preset matches what's actually in the repo. Worker script errors usually show up in real-time logs under Workers → your worker → Logs — that's the fastest place to spot a syntax or runtime issue.
If response times are still slow, the likely reason is that caching isn't actually kicking in. Check the CF-Cache-Status response header — a MISS or BYPASS means every request hits your origin. Review your Cache Rules and make sure the content type and URL pattern are actually matched. Also confirm that Cache-Control headers from your server aren't set to no-store.