Answered: Problème

Non mon serveur n'est pas en https, je l'ai donc remis en http comme demandé.

Voici le détail de mon fichier .ini :

[OCS Inventory Agent]
ComProvider=ComHTTP.dll
Debug=1
Local=
NoSoftware=0
HKCU=0
NoTAG=0
IpDisc=
[HTTP]
Server=http://monserveur/ocsinventory
SSL=0
CaBundle=cacert.pem
AuthRequired=0
User=
Pwd=
ProxyType=0
Proxy=
ProxyPort=0
ProxyAuthRequired=0
ProxyUser=
ProxyPwd=
[OCS Inventory Service]
PROLOG_FREQ=8
OLD_PROLOG_FREQ=8
TTO_WAIT=180
INVENTORY_ON_STARTUP=0

Et le log de l'agent :

Starting OCS Inventory NG Agent on Monday, February 20, 2017 14:58:56.
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)
    DLL PLUGIN => Searching for Plug-in DLL(s) in folder <C:\Program Files (x86)\OCS Inventory Agent\plugins>
    DLL PLUGIN => 0 DLL Plug-in(s) successfully loaded on 0 DLL(s) found
AGENT => Using network connection with Communication Server
    COM PROVIDER => Loading Communication Provider <C:\Program Files (x86)\OCS Inventory Agent\ComHTTP.dll>
AGENT => Using Communication Provider <OCS Inventory NG cURL Communication Provider> Version <2.3.0.0>
AGENT => Sending Prolog
    DID_CHECK => Read DeviceID <ET-221-2017-01-18-08-46-17> and MACs <AC:B5:7D:01:FB:3CAE:B5:7D:01:FB:3C30:10:B3:A8:52:26EC:B1:D7:96:AC:66> in file <ocsinventory.dat>
    COM SERVER => Initializing cURL library for sendRequest
    COM SERVER => Using cURL without server authentication
    COM SERVER => Disabling cURL proxy support
    COM SERVER => Enabling cURL SSL server validation support using CA Bundle <cacert.pem>
    COM SERVER => Sending HTTP Post request to URL <http://monserveur/ocsinventory>
    COM SERVER => HTTP Post response received <HTTP Status Code #400>
    COM SERVER => Cleaning cURL library
ERROR *** AGENT => Failed to send Prolog <HTTP Status Code #400>
AGENT => Unloading communication provider
AGENT => Unloading plug-in(s)
AGENT => Execution duration: 00:00:00.

Encore merci pour ton aide !