The logs scream TLS handshake error. You know the cause: IAST TLS configuration is broken.
Interactive Application Security Testing (IAST) detects issues in real time by watching requests as they run inside the app. When TLS is misconfigured, IAST finds it fast—if you know exactly how to set it up. Correct TLS setup is more than flipping a flag; it defines cipher strength, certificate validity, and protocol version. Weak parameters leave encrypted traffic exposed.
Start with protocol choice. Disable SSLv3, TLS 1.0, and TLS 1.1. Force TLS 1.2 or TLS 1.3. In your IAST agent configuration, set the tls.minVersion and tls.maxVersion fields to match these requirements. This ensures secure negotiation, removes old ciphers, and passes modern compliance checks.
Next, select ciphers. Favor AES-GCM over CBC. Avoid RSA key exchange. Choose ECDHE for forward secrecy. Most IAST agents allow a tls.ciphers directive. Limit to strong, tested algorithms. Check that the runtime libraries match your list—misalignment here is a silent failure point.
Certificates matter. Use an internal CA for staging, a public CA for production. Pin the server certificate inside the IAST configuration to block downgrade or impersonation attacks. Keep certificate chains complete and valid. Reload before expiration to prevent handshake disruption during critical runs.
Enable verification. Set tls.verifyPeer=true in the agent’s config. Without peer verification, you can capture traffic but not trust it. Verification ties packet data to a known, authenticated endpoint, which is essential for meaningful IAST analysis.
Monitor in real time. Once your TLS configuration is live, run a controlled test through the IAST agent. Use a tool like openssl s_client to check protocol, cipher, and certificate chains. Flag anything outside the approved range.
Perfect IAST TLS configuration is not optional. It is the lock on the door. Missteps here taint every security result you collect. Define the version, force strong ciphers, pin certificates, and verify peers. Test everything.
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