Also, the nginx log excerpt:
2016/04/30 14:36:55 [info] 25632#0: *1 SSL_do_handshake() failed (SSL: error:1408A0C1:SSL routines:SSL3_GET_CLIENT_HELLO:no shared cipher) while SSL handshaking, client: x.x.x.x, server: y.y.y.y:443
2016/04/30 14:36:55 [info] 25632#0: *1 SSL_do_handshake() failed (SSL: error:1408A0C1:SSL routines:SSL3_GET_CLIENT_HELLO:no shared cipher) while SSL handshaking, client: x.x.x.x, server: y.y.y.y:443