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.
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