Kintify

Fix: SSL Handshake Failed

Run `openssl s_client -showcerts -connect host:443`

SSL handshake failures are almost always a certificate chain, a hostname mismatch, or a TLS version / cipher mismatch.

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Frequently Asked Questions

What causes SSL Handshake Failed?

SSL handshake failures are almost always a certificate chain, a hostname mismatch, or a TLS version / cipher mismatch.

How to fix SSL Handshake Failed?

Check certificate chain and DNS resolution before rolling back. Run `openssl s_client -connect host:443` to inspect the chain and confirm SAN includes the hostname.

Example fix from Kintify Fix

Input: curl fails with SSL_ERROR_SYSCALL on handshake

Output: Check certificate chain and DNS resolution before rolling back. Run `openssl s_client -connect host:443` to inspect the chain and confirm SAN includes the hostname.

Used by developers debugging real production systems

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