How to use the ssl checker
The SSL checker retrieves the TLS certificate presented by a public hostname and summarizes validity dates, issuer, covered names and signature information. Use it to spot a missing, expired or mismatched certificate before visitors receive a browser warning.
Good reasons to use it
- Validate a certificate after enabling HTTPS or changing a CDN.
- Check whether a renewal completed before the existing certificate expires.
- Confirm that the requested hostname appears in the certificate names.
A reliable workflow
- Enter the hostname you want visitors to open.
- Review validity, issuer, covered names and expiration date.
- Test the same hostname in a browser and at the origin if a CDN is involved.
How to interpret the result
A valid certificate must be within its date window, chain to a trusted issuer and cover the requested hostname. The checker reports the certificate it receives from its own network path; a load balancer or regional edge may present a different certificate elsewhere.
Frequently asked questions
How soon should I renew a certificate?
Automated renewal should complete well before expiry. Investigate immediately if the remaining window is shorter than your provider’s normal renewal schedule.
Why is the hostname mismatch important?
Browsers verify that the requested hostname is listed in the certificate. A different or missing name can trigger a security warning.