Error while contacting server

Hello,

I was trying to contact my server and the following error appeared:

Starting OCS Inventory NG Agent on Monday, August 06, 2018 10:22:32.

AGENT => Running OCS Inventory NG Agent Version 2.3.1.1

AGENT => Using OCS Inventory NG FrameWork Version 2.3.1.1

AGENT => Loading plug-in(s)

AGENT => Using network connection with Communication Server

AGENT => Using Communication Provider <OCS Inventory NG cURL Communication Provider> Version <2.3.1.1>

AGENT => Sending Prolog

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.