Curl error: Unknown SSL protocol error in connection to api-partner.network.xero.com:443

response

Array
(
    [code] => 1
    [response] => Curl error: Unknown SSL protocol error in connection to api-partner.network.xero.com:443 
    [info] => Array
        (
            [url] => https://api-partner.network.xero.com/oauth/AccessToken?oauth_consumer_key=AFO6BYUHYCAJFZMGXGS9JPEOLO8JJC&oauth_nonce=5HRNR&oauth_session_handle=7XWVQLO5VPQW5IUA0PZ4&oauth_signature=f4HxkB28q44Dzr0TNeVdauWdSBIw8cb3EY8XDX1nXm2stt5E8Av1Eh7Fb%2FI9ZLxKqKH0WahdI9Ne6fOADyMiGbwJkuR4A9gnZmBsOmq%2BzZ4lwUG7evQuWpVOKptSoxy%2F9lhJrL3cLyZMnyNJfAyas4p%2Ftltkbp5z8jI0purWaRo%3D&oauth_signature_method=RSA-SHA1&oauth_timestamp=1450915629&oauth_token=5EX4B9FGX8H6T2I6K45XD09E9JSTEW&oauth_version=1.0&order=
            [content_type] => 
            [http_code] => 0
            [header_size] => 0
            [request_size] => 0
            [filetime] => -1
            [ssl_verify_result] => 0
            [redirect_count] => 0
            [total_time] => 0.000562
            [namelookup_time] => 2.7E-5
            [connect_time] => 0.000568
            [pretransfer_time] => 0
            [size_upload] => 0
            [size_download] => 0
            [speed_download] => 0
            [speed_upload] => 0
            [download_content_length] => -1
            [upload_content_length] => -1
            [starttransfer_time] => 0
            [redirect_time] => 0
            [redirect_url] => 
            [primary_ip] => 198.61.252.64
            [certinfo] => Array
                (
                )

            [primary_port] => 443
            [local_ip] => 192.237.188.167
            [local_port] => 35707
        )

    [format] => json
)