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1 change: 1 addition & 0 deletions networking/understanding-cloudflare.html.md
Original file line number Diff line number Diff line change
Expand Up @@ -114,6 +114,7 @@ These tools can help when diagnosing certificate or DNS issues:

- `fly certs check <hostname>`: Check ownership TXT status, custom certificate status, and ACME certificate status all in one place. This is the best starting point for debugging.
- [crt.sh](https://crt.sh/): Check issued certificates.
- [CertObserver CT search](https://certobserver.com/ct-search): Check issued certificates.
- [DNSChecker](https://dnschecker.org/): Confirm DNS propagation.
- [Let's Debug](https://letsdebug.net/): Analyze Let's Encrypt certificate validation issues.
- dig: Inspect DNS records from the command line.
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