Security & SSL

TLS Version Deprecated

TLS 1.0 and TLS 1.1 have been officially deprecated by IETF (RFC 8996) and major browsers. These older versions contain known vulnerabilities (BEAST, POODLE, Lucky13) and lack modern security features. Continuing to support them exposes users to downgrade attacks and creates compliance risks for PCI DSS and other standards.

Symptoms

  • Security scanners flagging TLS 1.0/1.1 support
  • PCI DSS compliance audit failures
  • Browser deprecation warnings in developer console
  • SSL grading tools capping score due to legacy TLS support

Common Causes

  • Server configured with default settings from older OS/software
  • Legacy client compatibility requirements keeping old TLS enabled
  • TLS configuration not reviewed after security updates
  • Load balancer or CDN still supporting deprecated versions

Step-by-Step Troubleshooting

  1. 1

    Check TLS versions supported

    Identify which TLS protocol versions your server supports.

    Use SSL Certificate Check →
  2. 2

    Review security headers

    Check for security headers that complement TLS configuration.

    Use HTTP Headers →
  3. 3

    Disable TLS 1.0 and 1.1

    Update server configuration to only support TLS 1.2 and TLS 1.3.

  4. 4

    Enable TLS 1.3

    Add TLS 1.3 support for the best security and performance (0-RTT handshakes).

  5. 5

    Verify configuration

    Re-scan to confirm deprecated versions are disabled.

    Use SSL Certificate Check →

Recommended Diagnostic Tools

SSL Certificate CheckHTTP Headers

Monitor TLS Configuration

Track TLS protocol versions and get alerts for deprecated version usage.

Related Problems

Frequently Asked Questions