FortiSIEM 7.5 Headless Windows Agent: Host Discovered but No Event Logs

Issue:

I’m deploying the FortiSIEM 7.5.0 Headless Windows Agent on a Windows machine in an OT environment. The communication path is Headless Agent → Diode Collector → L2.5 Virtual Collector → Supervisor. The Windows agent installation completes successfully, and the host is discovered in FortiSIEM, but no Windows Event Logs are being ingested.

Objective:

I’m trying to collect Windows Event Logs using the Headless Agent through the Diode Collector architecture. The OT Host Template is configured for Windows Event Logs. Has anyone encountered this issue or are there any additional configuration steps or prerequisites required for this deployment?

​@AEK