Unknown SSL protocol error in connection to [example.com]
When you see this error, your server (or an intermediary load balancer / proxy) is likely to instead require TLSv1.0 (SSLv3) and fails to correctly complete negotiation process with our TLS client.
This can be verified by using a recent versions of OpenSSL (>= 1.0.1) and disabling TLSv1.1:
openssl s_client -connect www.example.com:443 -no_tls1_1
connects successfully, whereas:
openssl s_client -connect www.example.com:443
This is often triggered by a bug in some reverse proxies / load balancers; for example some versions of "F5 Networks BIG-IP load balancer" are known to suffer from this issue.
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