Windows 2019: Lost IP address after PV upgrade to 6.4-6


New Member
Apr 22, 2020
Hello everyone,

Last night, I was upgrading our Proxmox environment (no cluster, just one node) and I faced a new problem.
I upgraded from PVE 6.3-3 to 6.4-6 and after rebooting, the 3 Windows VMs lost IP configuration.
I noticed that Windows (for every VM) didn't recognize the network device and I had to force IP address.
Before forcing the IP address, Windows said me that "there is another network device with that IP address. Do you want to replace that?"

Does anybody know anything about this issue?

Thanks in advance


Famous Member
Apr 2, 2010

they are a change in qemu 5.2 in pci root bridge, and windows think that we you have new devices (so lost ip config, as windows associated ip to device pci slot number)

proxmox have a new option "machine" in the gui, where you can setup version. (5.1 for example to keep old version"). I thinked it was keeping it on upgrade.

if you have already upgraded it, I think they are an option in windows to display old ghost devices, where you can remove ip address.


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