curl error 35 : unknown SSL protocol error in connection

Question

$ curl -I https://9.185.173.135
curl: (35) Unknown SSL protocol error in connection to 9.185.173.135:443

This is an secured page that I need to access.

Answer 1

I had the same error after updating my SSL certificate on the target SSL site. My source OS was Centos 6 and updating to a new curl version solved it. *Note I was already using the curl -k (insecure option) but I would still get that error. Essentially this error is caused by nss or openssl being out of date. yum -y install curl nss openssl Remember if you have a web application like PHP calling curl you will need to restart Apache to make the update take effect.

I've updated based on this guide: http://realtechtalk.com/curl_35_Unknown_SSL_protocol_error_in_connection_Solution_Centos-1988-articles