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by MrRadar 3935 days ago
The test site requires SNI and only accepts TLS 1.1 and 1.2 with ECDHE/DHE+AES-GCM/AES-CBC ciphers[0]. I'm guessing whatever SSL library your libcurl is linked against only supports TLS 1.0, doesn't support SNI, or doesn't support any of those cipher suites (OpenSSL 0.9.x won't work with this site, for example).

[0]: https://www.ssllabs.com/ssltest/analyze.html?d=helloworld.le...