Setup order
1
Point the record at us
Add the A record from Connect your domain, using the IP shown in your panel. The proxy can be on (orange cloud) or off.
2
Set SSL/TLS mode to Full
In Cloudflare: SSL/TLS → Overview → Full. Not Off, not Flexible, and not Full (strict) yet.
3
Let us verify and issue
Because the proxy hides your origin, we verify your domain by fetching a token from your site at
/.well-known/fastcat-domain-check. Leave /.well-known/ paths unblocked by any firewall or page rule.4
Switch to Full (strict)
Once the panel shows Live · SSL active, your origin has a valid Let’s Encrypt certificate. Move Cloudflare to Full (strict) for end-to-end verified encryption.
Which mode does what
Symptom of leaving SSL/TLS mode on Off: your domain never leaves Awaiting DNS setup, even though the DNS record is correct.
Other proxies and CDNs
The same rules apply to any proxy or CDN in front of your site:- The proxy’s origin must be the IP shown in your panel, reached over HTTPS.
- Requests to
/.well-known/must reach the origin so verification and certificate issuance can complete. - Don’t force a plain-HTTP connection to the origin.