You are not allowed to access this file. Check frontend_dev.php for more information.

If you had deployed to production/LIVE environment and encounter this error message when you tried to access fontend_dev.php, it is due to a security IP check in fontend_dev.php to check for 127.0.0.1 before it continue.

Thus, you need to add your public IP address in fontend_dev.php to tell symfony to let you through in the production environment. Here’s how to do it

In your fontend_dev.php file, put in the below line to print out your public ip address

echo $_SERVER['REMOTE_ADDR']. "<br/>"

Access frontend_dev.php and copy the IP address as shown.

Edit frontend_dev.php and change the line

if (!in_array(@$_SERVER['REMOTE_ADDR'], array('127.0.0.1', '::1')))

to

if (!in_array(@$_SERVER['REMOTE_ADDR'], array('127.0.0.1', '::1', '111.222.333.444')))

Where 111.222.333.444 is the IP address you copied.

Upload back the frontend_dev.php and try again