Strange... and other vm's running normal? Like Windows 2012r2, 2008 or Ubuntu Linux?
bootdisk: scsi0
cores: 8
cpuunits: 10000
description: Windows 2016 Server
hotplug: disk,network,usb,memory,cpu
memory: 4096
name: win16.tux.local
net0: virtio=BE:83:B1:85:C1:FE,bridge=vmbr0
numa: 1
onboot: 1
ostype: win10
protection: 1
sata0: none,media=cdrom
scsi0: SSD-vmdata-KVM:vm-109-disk-1,discard=on,size=32G
scsihw: virtio-scsi-pci
smbios1: uuid=6c254cb1-78f2-4d62-8c83-cb2266e49607
sockets: 1
vcpus: 8
vga: qxl
agent: 1
bootdisk: scsi0
cores: 8
memory: 4096
name: w2016
net0: virtio=DA:C0:D4:56:00:05,bridge=vmbr0
net1: e1000=D6:51:49:70:88:61,bridge=vmbr0,tag=666
numa: 0
ostype: win10
scsi0: local-lvm:vm-100-disk-1,discard=on,size=100G
scsi1: local-lvm:vm-100-disk-2,discard=on,size=1000G
scsihw: virtio-scsi-pci
smbios1: uuid=0c8ca5a2-86c9-4dbd-ada8-646635ccbf38
sockets: 1
Can you build your essentials with legacy hardware for test? So IDE disk, 100mbit network...
But for the first test give your server only 1 CPU and one core.
I too have this issue.
(Proxmox 5.1-39)
During Windows Server 2016 Essentials bootup it trigger the Error Messsage on Console.
But what is really strange that when I do a benchmark with CrystalDiskMark in the VM the complete Host crashes!
That is very reassuring but that is another topic ...

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