SSL/TLS Checker
Inspect a live server's TLS configuration, certificate chain, supported protocols, and cryptographic settings.
Server target
Inspect the live TLS endpoint. Private and reserved network targets are blocked.
Transport Layer Security
Review HTTPS and TLS configuration before deployment
TLS protects data exchanged between clients and servers. Regularly reviewing certificates, protocol support, and cryptographic settings helps identify configuration mistakes before they affect users.
What this tool checks
Review the negotiated TLS protocol, cipher suite, certificate chain, hostname validation, expiration, issuer information, supported algorithms, and common HTTPS configuration issues.
Responsible use
Only test servers that you own or are authorized to assess. This tool performs a limited TLS connection for analysis and is not intended for penetration testing or vulnerability exploitation.
Guide
About SSL and TLS Checker
A live TLS check reveals the certificate chain and connection settings presented by a server.
This tool connects to an authorized public endpoint and reports protocol, cipher, certificate, identity, and trust-related details.
Results describe one connection path and should be combined with broader security testing and monitoring.
What the checker reviews
The available information depends on the live endpoint and server configuration.
- Negotiated TLS protocol
- Cipher suite
- Leaf and chain certificates
- Expiration dates
- Hostname identities
- Trust and chain findings
Certificate-chain issues
Missing intermediates, incorrect order, expired certificates, hostname mismatches, and untrusted issuers can cause TLS failures.
Protocol and cipher security
Deprecated protocols and weak algorithms should be disabled according to platform compatibility and organizational policy.
Responsible use
Only check hosts you own or are authorized to assess. The tool performs a limited TLS connection, not exploitation.
FAQ
Frequently asked questions
What does an SSL/TLS checker test?
It inspects a live TLS connection, certificates, protocol, cipher, and related configuration.
Why is the certificate chain incomplete?
The server may not be sending one or more required intermediate certificates.
What causes a hostname mismatch?
The requested hostname is not covered by the certificate's Subject Alternative Names.
Does a valid certificate mean the site is secure?
No. TLS is only one part of application security.
Why might results differ from a browser?
Clients can use different trust stores, protocol support, network paths, and cached intermediates.
Does this contact the target server?
Yes. A live TLS check requires a server-side network connection.
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