Mart456 on "[Plugin: WP Mail SMTP] Timeout Sending Test message"

This in the nginx error log:
2016/04/14 09:32:38 [error] 1311#0: *1203 upstream timed out (110: Connection timed out) while reading response header from upstream, client: 78.175.143.81, server: xxxxx.com, request: "POST /wp-admin/options-general.php?page=wp-mail-smtp/wp_mail_smtp.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php-fpm/php-fpm.sock", host: "travelactiv.com", referrer: "https://xxxxx/wp-admin/options-general.php?page=wp-mail-smtp%2Fwp_mail_smtp.php"