FYI
So I had this issue with Windows Server 2019. When I downgraded the machine back to Windows Server 2016. I no longer had the issue. I have 2 Windows Server 2016's running Firedaemon & DCS Dedi Server 2.9+ and they seem to run fine.
Might be of interest .
Has there been any response from support on this, I have an old server which is working fine with Firedaemon, but a clean install today which has this issue!