Permission denied on http://SERVER/ocsreports/

Hi, when I go to the home page ocsreports it shows me :

ERROR: MySql connection problem 2002
Permission denied
ERROR: MySql connection problem 2002
Permission denied

It worked yesterday.

httpd/error_log shows:

PHP Warning: mysqli_fetch_object() expect parameter 1 to be mysqli_result, null given in /usr/share/ocsinventory-reports/ocsreports/require/function_commun.php on line 38

Same error on line 67 / 104 / and again 38 with different mysqli methods.

OS : CentOS 7
OCS Server and agent version : 2.8

I've checked:
-All services are running
-Privileges for root and ocs admin on the database (MariaDB 10.5.5)
-dbconfig.inc.php user / password and port aree good.

Any ideas ?