SSL / TLS Check
Inspect the TLS certificate, issuer, validity and chain of a host.
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Enter a host above and press Run to start the check.
About the SSL / TLS Check
The SSL / TLS Check inspects the certificate a host presents over HTTPS and reports its issuer, validity period, days remaining until expiry, the full chain of trust, and the negotiated cipher. It is the fastest way to confirm a certificate is valid, properly chained, and not about to expire. Use it to avoid surprise outages from lapsed certificates and to verify your TLS configuration.
How to use
- Enter the hostname you want to inspect, such as example.com.
- Click Check to establish a TLS connection.
- Review the issuer, validity dates, and days remaining.
- Verify the certificate chain and negotiated cipher.
Frequently asked questions
- What does days remaining tell me?
- It is the number of days until the certificate expires. Renew well before this reaches zero to prevent browsers from showing security warnings.
- Why does the certificate chain matter?
- Browsers trust a certificate only if it links back to a trusted root through valid intermediate certificates. A broken or incomplete chain causes trust errors.
- What is the cipher and why is it shown?
- The cipher suite is the encryption algorithm negotiated for the connection. Reviewing it helps confirm the server uses modern, secure settings.