On your server, you might have a version of OpenSSL that was compiled without support for ECC (and thus ECDHE). You can run the nmap --script ssl-enum-ciphers -p 443 name-of-your-site to see what ciphers are supported on your server, and in which order. For more detail you may read the preferred answer to the "Apache SSL: 'an obsolete key exchange (RSA)'” question <https://stackoverflow.com/questions/43895895/apache-ssl-an-obsolete-key-exchange-rsa> on stackoverflow.
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