Answered: ERROR *** AGENT => Failed to send Prolog

I also have the same problem

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Starting OCS Inventory NG Agent on Friday, January 22, 2021 15:58:04.

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)

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 <2.3.1.1>

AGENT => Sending getLabel request

COM SERVER => Initializing cURL library for getFile

COM SERVER => Using cURL without server authentication

COM SERVER => Disabling cURL proxy support

COM SERVER => Enabling cURL SSL server validation support using CA Bundle <C:\ProgramData\OCS Inventory NG\Agent\cacert.pem>

COM SERVER => Sending fileGet request to URL <http://192.168.10.9/ocsinventory/deploy/label>

COM SERVER => fileGet response received <HTTP Status Code #500>

COM SERVER => Cleaning cURL library

AGENT => Failed to retrieve Label <HTTP Status Code #500>

AGENT => Sending Prolog

DID_CHECK => Read DeviceID <PCNT4HSCMD2-2021-01-22-15-53-57> and MACs <F4:8E:38:E3:AE:D640:49:0F:FD:4B:F800:FF:46:F4:20:7100:FF:46:F4:20:7100:FF:46:F4:20:7100:FF:46:F4:20:7100:FF:46:F4:20:7100:FF:46:F4:20:71> 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 <C:\ProgramData\OCS Inventory NG\Agent\cacert.pem>

COM SERVER => Sending HTTP Post request to URL <http://192.168.10.9/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.