hi, thanks for your answers.
okay, the Communication could really be the problem.
The client runs in a closed environment that has no connection and will have no connection to the Internet. All communication must go through the ESMC which is for sure connected to the internet.
Does the client really need to connect to edf.eset.com?
I searched for an agent log on both systems (Linux client and ESMC), but found nothing suitable. There is a trace.log on both systems but there is nothing about an "EcpCommunicator" inside.
thanks!