Answered: No connection between OCS inventory and agent

I have the same problem.

CentOS 6.8
Server version: 5.5.54 MySQL Community Server (GPL) by Remi
PHP 5.6.30 (cli) (built: Jan 19 2017 08:00:02)
OCSInventory Server 2.3
OCSNG-Windows-Agent-2.3.0.0