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Use OpenSSL s_client to perform a live TLS handshake, inspect protocol, cipher, and certificate chain, and isolate handshake failures with version‑forcing and SNI flags.
TLS Handshake Behavior Without Client Certificates When using openssl s_client to validate a server integration, it is often necessary to test the connection without providing production private keys or certificates via the -cert and -key flags. In OpenSSL 3.x, the tool's behavior during the handshake depends heavily on the server's supported cipher suites a
openssl