smtp are just right, but can not send send Diagnostic email, wating for 1 -2 mitutes with loading, after that I get 404 page.the log say: Invalid CSRF token on http://help.xxx.com/thanks!here is some system info:osTicket Version v1.10.1 (9ae093d) — Up to dateWeb Server Software nginx/1.12.2MySQL Version 5.5.57PHP Version 5.4.45here is the php log: WARNING: child 32243, script '/www/wwwroot/help.xxx.com/upload/scp/emailtest.php' (request: "POST /scp/emailtest.php") execution timed out (104.015626 sec), terminating WARNING: child 32243 exited on signal 15 (SIGTERM) after 54086.648463 seconds from start NOTICE: child 13128 started