Failed to send Inventory

Hello,

some windows-agents produced an error  "Failed to send Inventory <HTTP Status Code #500" Many other agents works fine. The installation on the machines are exactly the same! rolled out with Software distribution from Kaspersky.

Here is the content of the agents log:

==============================================================================
Starting OCS Inventory NG Agent on Thursday, February 09, 2017 12:13:06.
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 <WSFREILANB01-2017-02-08-14-26-24> and MACs <88:AE:1D:E8:FB:A2EA:39:DF:C5:C9:72E8:39:DF:C5:C9:7200:FF:F4:83:12:24> 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 => Disabling cURL SSL server validation support
    COM SERVER => Sending HTTP Post request to URL <http://192.168.110.26/ocsinventory>
    COM SERVER => HTTP Post response received <HTTP Status Code #200>
    COM SERVER => Cleaning cURL library
AGENT => Prolog successfully sent
SUPPORT => No support detected, Registration key : N/A
    AGENT => Prolog Frequency set to 24 hour(s)
AGENT => Inventory required
AGENT => Launching hardware and software checks
    INVENTORY => Loading Download history
    INVENTORY => Logged on user ID is <Admin>
    INVENTORY => Operating System is <Microsoft Windows 10 Pro 10.0.14393 >, description <>
    INVENTORY => Operating System uses 64 bits memory address width
    INVENTORY => Computer domain or workgroup is <example>
    INVENTORY => User domain is <>
    INVENTORY => System Manufacturer <TOSHIBA>, System Model <Satellite Pro L670>, System S/N <deleted_for_post_here>, Bios Manufacturer <TOSHIBA>, Bios Date <01/20/11>, Bios Version <2.10>, Motherboard Manufacturer <TOSHIBA>, Motherboard Model <NALAA>, Motherboard S/N <123456789AB>
    INVENTORY => 1 processor(s) Intel(R) Core(TM) i3 CPU       M 370  @ 2.40GHz [2 core(s) x86_64] at 2399 MHz
    INVENTORY => OS Memory 1907 MB, OS Swap size 2995 MB
    INVENTORY => 2 memory slot(s) found
    INVENTORY => 3 input device(s) found
    INVENTORY => 2 system port(s) found
    INVENTORY => 1 system slot(s) found
    INVENTORY => 4 system controller(s) found
    INVENTORY => 4 storage peripheral(s) found
    INVENTORY => 2 sound device(s) found
    INVENTORY => 2 modem(s) found
    INVENTORY => 4 network adapter(s) found
    INVENTORY => 10 system printer(s) found
    INVENTORY => 1 video adapter(s) found
    INVENTORY => 1 system monitor(s) found
    INVENTORY => Default IPv4 address is <192.168.189.51>
    INVENTORY => Registered company <Microsoft>, registered owner <Admin>, Product ID <00330-80...>
    INVENTORY => Product key <TY4CG-JD...>
    INVENTORY => 106 software found
    INVENTORY => Computer/VM UUID is <945A9941-50BD-DF11-A121-88AE1DE8FBA2>
    INVENTORY => Computer seems to be Microsoft virtual host
    INVENTORY => System Memory set to 2048 (instead of 1907)
    INVENTORY => Reading last inventory state
    EXECUTABLE PLUGIN => Searching for VBS script(s) in folder <C:\Program Files (x86)\OCS Inventory Agent\plugins>
    EXECUTABLE PLUGIN => Searching for executable(s) in folder <C:\Program Files (x86)\OCS Inventory Agent\plugins>
AGENT => Sending Inventory
    INVENTORY => Checking last inventory state
    INVENTORY => Storage peripherals inventory state changed
    INVENTORY => Logical drives inventory state changed
    INVENTORY => Modems inventory state changed
    INVENTORY => Printers inventory state changed
    INVENTORY => Software inventory state changed
INVENTORY => Inventory changed since last run
    INVENTORY => Generating XML document with Device properties
    INVENTORY => XML Update BIOS
    INVENTORY => XML Update 1 CPU(s)
    INVENTORY => XML Update 2 Memory Slot(s)
    INVENTORY => XML Update 3 Input Device(s)
    INVENTORY => XML Update 2 System Port(s)
    INVENTORY => XML Update 4 System Controller(s)
    INVENTORY => XML Update 1 System Slot(s)
    INVENTORY => XML Update 2 Sound Device(s)
    INVENTORY => XML Update 4 Storage Peripheral(s)
    INVENTORY => XML Update 5 Logical Drive(s)
    INVENTORY => XML Update 2 Modem(s)
    INVENTORY => XML Update 4 Network Adapter(s)
    INVENTORY => XML Update 1 Video Adapter(s)
    INVENTORY => XML Update 1 Monitor(s)
    INVENTORY => XML Update 10 Printer(s)
    INVENTORY => XML Update 107 Software
    INVENTORY => XML Update 0 Registry Value(s)
    INVENTORY => XML Update Administrative Information(s)
    INVENTORY => XML Update common Device properties
    COM SERVER => Initializing cURL library for sendRequest
    COM SERVER => Using cURL without server authentication
    COM SERVER => Disabling cURL proxy support
    COM SERVER => Disabling cURL SSL server validation support
    COM SERVER => Sending HTTP Post request to URL <http://192.168.110.26/ocsinventory>
    COM SERVER => HTTP Post response received <HTTP Status Code #500>
    COM SERVER => Cleaning cURL library
ERROR *** AGENT => Failed to send Inventory <HTTP Status Code #500>
AGENT =>  Communication Server ask for Package Download
    DOWNLOAD => Package history file cleaning not required
    DOWNLOAD => Download disabled by server
AGENT => Unloading communication provider
AGENT => Unloading plug-in(s)
AGENT => Execution duration: 00:00:10