Now I'm running
PHP 5.6.29 (cli),
curl 7.19.7 (x86_64-redhat-linux-gnu) and
Apache/2.2.15 (Unix) on Ubuntu Server 14.04.
But when I go to FB and try to subscribe to that URL - it keeps failing with this error:
The URL couldn't be validated. Callback verification failed with the following errors: curl_errno = 60; Curl_error = SSL certificate problem: unable to get local issuer certificate; HTTP Status Code = 200; HTTP Message = Connection established
Can anyone advise on what else can I try? Thanks a lot