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Diagnose a failing TLS connection: "SSL handshake failed", "tlsv1 alert", "unable to get local issuer certificate", "works in the browser but not curl", "certificate required" on mTLS. Establish TCP reachability, then run openssl s_client -connect host:443 -servername host -showcerts, because a missing SNI returns the wrong certificate. Read in order: certificate served, whether the chain includes the intermediate (browsers fetch it via AIA, curl and Java do not), hostname against SAN not CN, validity dates and client clock, protocol and cipher overlap, ALPN, and for mTLS the CertificateRequest and CA list. Separate server faults from client trust with --resolve from a clean client; capture the alert first. Use for any handshake failure. Not for an internal CA that clients do not trust yet (private-ca-trust-distribution), issuance and renewal (certificate-automation), allowed protocols (host-hardening) or app code (debugging).
tls-handshake-debugging is an agent skill entry in ChatHome Skills, sourced from GitHub Skill Search and scored 58/100. # TLS Handshake Debugging This skill is done when you can state which side failed and at which step (reachability, certificate served, chain, name, validity, pr. As an agent skill, it packages a reusable instruction set that AI coding agents such as Codex and Claude Code can load to perform this task without hand-written glue code. ChatHome Skills discovered this entry through its daily ingest of official registries and GitHub discovery queries, and re-verifies repository facts, freshness signals, and install metadata on every run. The quality score weighs official-registry presence, a working install command, license clarity, GitHub star trajectory, and repository freshness — the full formula is on the Sources page. The install command above is ready to copy. Review the last-pushed date and repository status before adding tls-handshake-debugging to a production agent workflow; the snapshot facts below are point-in-time values from the most recent ingest.
codex skill install greenblacked/AIReview the upstream source before running this command.
Scan coverage: Install metadata and the indexed document body.
Automated signals from install metadata and a bounded skill body — not a full code security audit and not a recursive source or dependency review.
# TLS Handshake Debugging This skill is done when you can state which side failed and at which step (reachability, certificate served, chain, name, validity, protocol or cipher ove