Host losing network when starting Windows 2025 VM

F

FrankWest

New Member
May 3, 2025
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Hi,

I've quite a strange issue. I've have a host in my lab with several Linux VM's. That works perfectly fine. However, once I create a Windows Server 2025 VM's and run it, the host loses it's network connectivity and I have to reboot it in order to get access again. I've tried everything I could find, disabling ASPM in the kernel, disabling hardware offloading on the NIC. During the setup of Windows it works fine, but as soon as the VM is fully up and running, the host loses it's network connectivity after a random period of time. As soon as the Windows VM is shutdown, the proxmox host is stable again.

The NIC is a ' AQC107 NBase-T/IEEE 802.3bz Ethernet Controller [AQtion]' controller. Proxmox version is 8.4.1.

Any ideas?

Frank.
 
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So if you take away it's NIC it doesn't bring down the host? you're passthroughing the AQC107? how about just e1000e on the vmbr0?
 
Without a virtual NIC present on the Windows vm, the host is stable. As soon as I give the vm a virtual NIC (even a e1000) the host looses its connectivity after a while. I’m not doing any pass through. The host doesn’t crash, so I can still access it on the console and reboot it from there.
 
what if you create a new bridge and put the VM on that? just to see what it does. I would probably work, but something to build from

also make a quick additional win10 or win11 VM. does that crash the vmbr0?
 
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