FB SDK and cURL: Unknown SSL protocol error in connection to graph.facebook.com:443

Using FaceBook SDK (fetched today) I am getting error

Fatal error: Uncaught CurlException: 35: Unknown SSL protocol error in connection to graph.facebook.com:443 thrown in /var/www/clients/client18/web29/web/classDBI/base_facebook.php on line 996

I have gone over a dozen related posts and implemented all recommended changes without success.

This post suggests it may clear up on it's own?

Current cURL opts are below and situation persists even if I take unadvised measure of adding


Current opts


Does anyone have an additional opt or test I can try?


As in the case of this post adding CURLOPT_SSLVERSION => 3 did not immediately resolve the issue today the SSL has been re-validated and accepted.


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