Problème de remontée d'inventaire

Bonjour,

J'ai migré mon serveur de debian 6 en 7.

Tout fonctionne correctement sauf pour les nouveaux PC installée, la remontée d'inventaire ne se fait pas.

J'ai l'erreur suivante dans le fichier de log de l'agent :

Starting OCS Inventory NG Agent on Monday, September 12, 2016 10:47:07.
AGENT => Running OCS Inventory NG Agent Version 2.1.1.3
AGENT => Using OCS Inventory NG FrameWork Version 2.1.1.3
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 <2.1.1.3>
AGENT => Sending Prolog
    DID_CHECK => Read DeviceID <REPRO-2016-09-07-16-43-07> and MACs <1C:6F:65:0B:2E:F2> 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://ocsinventory-ng.intra.insa-cvl.fr/ocsinventory>
    COM SERVER => HTTP Post response received <HTTP Status Code #500>
    COM SERVER => Cleaning cURL library
ERROR *** AGENT => Failed to send Prolog <HTTP Status Code #500>
AGENT => Unloading communication provider
AGENT => Unloading plug-in(s)
AGENT => Execution duration: 00:00:00.

Je ne comprends pas le problème les anciennes machines déjà présente remonte bien.

Une idée ?