Agent windows error http 405

Hello,

Hi have a server OCS and i have install the agent windows on my server, the sync with the server doesn't work and in the file OCSInventory.conf

I have this error :

Starting OCS Inventory NG Agent on Thursday, February 23, 2017 13:36:57.
AGENT => Running OCS Inventory NG Agent Version 2.3.0.0
AGENT => Using OCS Inventory NG FrameWork Version 2.3.0.0
AGENT => Loading plug-in(s)
AGENT => Using network connection with Communication Server
AGENT => Using Communication Provider <OCS Inventory NG cURL Communication Provider> Version <2.3.0.0>
AGENT => Sending Prolog
ERROR *** AGENT => Failed to send Prolog <HTTP Status Code #405>
AGENT => Unloading communication provider
AGENT => Unloading plug-in(s)
AGENT => Execution duration: 00:00:00.