root@sclrdev:/home/sclr/certs/FreshCerts# curl --ftp-ssl --verbose ftp://{abc}/ -u trup:trup --cacert /etc/ssl/certs/ca-certificates.crt * About to connect() to {abc
this can help you for guzzle :
$client = new Client(env('API_HOST')); $client->setSslVerification(false);
tested on guzzle/guzzle 3.*