TLS configuration is more than a checkbox for regulatory requirements. For financial firms under FINRA, it is a critical control for protecting client data and maintaining audit readiness. Misconfigured TLS can expose systems to weak ciphers, outdated protocols, and man-in-the-middle attacks. Regulators know this, and so do attackers.
To meet FINRA compliance, start with TLS 1.2 or higher. TLS 1.3 is preferred for reduced attack surface and faster negotiation. Disable SSL versions and any TLS 1.0 or 1.1 support. This eliminates known vulnerabilities. Audit every endpoint, including APIs, internal services, and management interfaces.
Select strong cipher suites only. Prioritize ECDHE for key exchange, AES-GCM for encryption, and SHA-256 or stronger for hashing. Remove RSA key exchange modes where possible. Perfect forward secrecy must be standard. Test with automated scanners, but also verify manually using tools like OpenSSL and Nmap to catch edge-case exposure.
Certificate management is part of TLS compliance. All certificates should use at least 2048-bit RSA or elliptic curve keys. Enforce short lifetimes and automated rotation. Verify that Common Name (CN) and Subject Alternative Names (SAN) are correct and match the intended hosts. Monitor expiration dates.