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Supported SSL/TLS Protocols

Supported SSL/TLS Protocols represent the complete list of protocol versions that a server is configured to accept and negotiate with connecting clients. This configuration determines which clients can successfully establish secure connections and influences both security posture and compatibility with older systems.

General

Understanding Supported SSL/TLS Protocols

Supported SSL/TLS Protocols represent the complete list of protocol versions that a server is configured to accept and negotiate with connecting clients. This configuration determines which clients can successfully establish secure connections and influences both security posture and compatibility with older systems.

Protocol Version Landscape

Modern servers typically support multiple protocol versions to balance security and compatibility:

  • TLS 1.3: Latest standard offering optimal security and performance
  • TLS 1.2: Widely supported, secure when properly configured
  • TLS 1.1: Deprecated, should be disabled for security
  • TLS 1.0: Legacy protocol with known vulnerabilities
  • SSL 3.0/2.0: Obsolete protocols that should never be enabled

Configuration Strategy and Security

Best practice involves supporting only TLS 1.2 and 1.3 while disabling older, vulnerable protocols. However, some organizations maintain broader protocol support to accommodate legacy systems that cannot be immediately updated. The supported protocols list should be regularly reviewed and updated as part of security maintenance, with older protocols disabled as soon as operational requirements permit. This configuration directly impacts PCI DSS compliance, security audit results, and overall risk exposure from protocol-level vulnerabilities.

Protocol mismatches can surface as ERR_SSL_PROTOCOL_ERROR in browsers.

Related SSL Terms

Certificate Expires On

The Certificate Expiration Date indicates the exact timestamp when an SSL/TLS certificate will cease to be valid and trusted by browsers and other client applications. After this date, the certificate enters an expired state and will trigger security warnings, potentially blocking access to the secured website or service.

General

Certificate Chain Validation

Certificate Chain Validation is the process of verifying that an SSL/TLS certificate is authentic and trustworthy by checking its complete chain of trust back to a recognized Certificate Authority (CA). This validation ensures that each certificate in the chain is properly signed by its issuer and that the entire chain leads to a trusted root certificate installed in the client''s trust store.

General

Last Checked

The Last Checked timestamp indicates when the SSL/TLS certificate''s status and properties were most recently verified by the monitoring system. This timestamp is crucial for understanding the freshness of certificate data and ensuring that any changes or issues with the certificate are detected promptly.

General

Know the term. Now monitor it.

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