By SSLMate
If you get a NET::ERR_CERTIFICATE_TRANSPARENCY_REQUIRED error
when visiting your website in Google Chrome, your website's SSL certificate might
violate Chrome's Certificate Transparency policy.
Use this tool to check if your website is compliant with Apple and Chrome Certificate Transparency policies. If the tool reports that your website's certificate is non-compliant, contact your certificate authority as soon as possible to get a new, compliant certificate.
Cert Spotter monitors your entire SSL certificate portfolio and alerts you about security and availability problems like non-compliant, unauthorized, or expiring certificates.
This tool has helped site owners diagnose the following notable incidents:
In May 2025, GoDaddy submitted certificates to the wrong logs, causing the certificates to be rejected by Safari.
In March 2023, certificate authorities issued over 150,000 certificates with invalid SCTs, causing the certificates to be rejected by both Safari and Chrome.
In May 2022, Google Chrome prematurely retired some Certificate Transparency logs, leading to
NET::ERR_CERTIFICATE_TRANSPARENCY_REQUIRED errors when visiting some websites.
In May 2021, macOS 11.4 and iOS 14.6 introduced new Certificate Transparency requirements. Several certificate authorities failed to comply with the new policies, leading to websites failing to load in Safari.
Your site is not compliant with Chrome's Certificate Transparency policy.
Your site is not compliant with Apple's Certificate Transparency policy.
| Mechanism | Log | Signature | Log Status | Timestamp | |
|---|---|---|---|---|---|
| Apple | Chrome | ||||