php - curl errno 35 (Unknown SSL protocol error in connection to [secure site]:443)

Question

i'm trying to make post to an external url using curl, the externa page use https, here is the desc of the server i'm using

Server Apache/2.2.11 (Win32) mod_ssl/2.2.11 OpenSSL/0.9.8k PHP/5.3.0

the external url make a redirect to another url that i send in the post, but everytime i try i get this error

curl_errno=35 (Unknown SSL protocol error in connection to [secure site]:443)

so i check the firebug for the response and it say

Failed to load source for: http://localhost/3Party/PHP_VPC_3Party_Auth_Capture_Order_DO.php

Here is the code I'm using

ob_start();

// initialise Client URL object
$ch = curl_init();
// set the URL of the VPC

curl_setopt ($ch, CURLOPT_URL, $vpcURL);
curl_setopt ($ch, CURLOPT_POST, 1);
curl_setopt ($ch, CURLOPT_POSTFIELDS, $this->postData);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);  
curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_exec ($ch);
if (curl_error($ch)) {
    $this->errorMessage = 
        "curl_errno=". curl_errno($ch) . " (" . curl_error($ch) . ")";
}
curl_close ($ch);

Answer 1

I think the problem is the fact that you are trying to access an "http" URL (instead of "https") on port 443.

You can also try setting the SSL version manually:

curl_setopt($ch, CURLOPT_SSLVERSION, 3);

Replace 3 with whatever SSL version the remote server is using.