curl_exec: Peer certificate cannot be authenticated with known CA certificates. (no replies)

After upgrade to 2.8.0, I can't archive anymore, message is:

/usr/bin/php -f /var/www/vhosts/example.com/httpdocs/_stats/console core:archive --url=https://example.com/_stats/
INFO CoreConsole[2014-10-16 05:19:31] [ae62b] ---------------------------
INFO CoreConsole[2014-10-16 05:19:31] [ae62b] INIT
INFO CoreConsole[2014-10-16 05:19:31] [ae62b] Piwik is installed at: https://example.com/_stats/index.php
INFO CoreConsole[2014-10-16 05:19:31] [ae62b] Running Piwik 2.8.0 as Super User
ERROR CoreConsole[2014-10-16 05:19:32] [ae62b] The Piwik URL https://example.com/_stats/index.php does not seem to be pointing to a Piwik server. Response was 'Got invalid response from API request: https://example.com/_stats/index.php?module=API&method=API.getDefaultMetricTranslations&format=original&serialize=1&trigger=archivephp. Response was 'curl_exec: Peer certificate cannot be authenticated with known CA certificates. Hostname requested was: example.com''.
ERROR CoreConsole[2014-10-16 05:19:32] [ae62b] The Piwik URL https://example.com/_stats/index.php does not seem to be pointing to a Piwik server. Response was 'Got invalid response from API request: https://example.com/_stats/index.php?module=API&method=API.getDefaultMetricTranslations&format=original&serialize=1&trigger=archivephp. Response was 'curl_exec: Peer certificate cannot be authenticated with known CA certificates. Hostname requested was: example.com''.

Nothing changed in server configuration, just upgraded Piwik to 2.8.0 and before, archiving worked fine. Using a valid SSL Certificate for the website.