To run CRON in Vtiger or check either cron run successfully or not go to address bar and type “www.example.com/vtigercron.php”.
It shows Access denied, so to solve this issue follow these simple steps:-
Overcome the Error “Access Denied”.
Go to vtigercron.php and find
if(vtigercron_detect_run_in_cli() || (isset($_SESSION["authenticated_user_id"]) && isset($_SESSION["app_unique_key"]) && $_SESSION["app_unique_key"] == $application_unique_key)){
Replace with