The certificate is valid and trusted. No issues found.
Certificate revoked
Certificate expired
Validity period is ending. The certificate is valid but needs attention.
Certificate with an untrusted issuer
Certificate with a hostname mismatch
Self-signed certificate
Weak DH parameters. The certificate is valid but needs attention.
Incomplete certificate chain. The certificate is valid but needs attention.
Domain
Key
Valid until
Remaining
Issuer
Subject (CN)
Signature
SHA-256
Reason for invalidityCategoryexpiredThe certificate has expired
Reason for invalidityCategoryrevokedRevocation reasonCertificate key compromisedCA key compromisedCertificate holder details changedCertificate supersededCertificate no longer in useCertificate operation temporarily suspendedCertificate removed from CRLCertificate holder privileges withdrawnAttribute authority compromisedRevocation reason not specifiedRevokedCheck methodCheckedSourceList valid untilThe certificate was revoked early by the certificate authority before its expiration date. Browsers block such certificates.
Immediate reissuance is required.
Reason for invalidityCategoryhostname_mismatchRequested hostThe requested host is not present in the certificate’s Subject CN or SAN.
Reason for invalidityCategoryself_signedThe certificate is signed with its own key rather than by a trusted CA. It is not suitable for public access.
Reason for invalidityCategoryuntrusted_issuerValidation codeOpenSSL messageThe CA root certificate is missing from the OS/browser trust store —
the trust chain cannot be built.
Security warningCategoryweak_dhThe server uses weak Diffie-Hellman parameters (DH ≤1024 bits). Enable modern ECDHE ciphers.
Security warningCategoryincomplete_chain_recoveredThe server did not provide the intermediate certificates. The chain was completed via AIA, but some clients
may still see a trust error. Install the intermediate certificate on the server.
A TLS connection will be established to , and the certificate’s validity and trust chain will be checked.
The check takes a few seconds.
Checking certificate
DNS-резолвинг и TCP-соединение
TLS-handshake
Разбор сертификата и SAN
Проверка цепочки доверия
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