Guest agent not running on Windows 11

IsThisThingOn

Well-Known Member
Nov 26, 2021
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125
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I have a problem with only one VM.
That VM for unknown reasons sometimes loses guest agent. This is pretty bad, because that makes also the backup impossible, since I do backups to PBS with stop mode.

Is there a known issue with this config?

I had it once before, did not think much of it and upgraded virtio tools to 0.1.285. It worked after the update for some time but know seems to act up again sporadically.
The probably strangest part is that it does not even work after a reboot sometimes.
Like right now, when I got to services, QEMU guest agent is not running. Even though it has Automatically as startup option. I can start it manually, no problem.

Windows is 25H2
QEMU is 0.1.285


Code:
proxmox-ve: 8.4.0 (running kernel: 6.8.12-15-pve)
pve-manager: 8.4.14 (running version: 8.4.14/b502d23c55afcba1)
proxmox-kernel-helper: 8.1.4
proxmox-kernel-6.8: 6.8.12-15
proxmox-kernel-6.8.12-15-pve-signed: 6.8.12-15
proxmox-kernel-6.8.12-13-pve-signed: 6.8.12-13
proxmox-kernel-6.8.12-11-pve-signed: 6.8.12-11
proxmox-kernel-6.8.4-2-pve-signed: 6.8.4-2
ceph-fuse: 17.2.8-pve2
corosync: 3.1.9-pve1
criu: 3.17.1-2+deb12u2
glusterfs-client: 10.3-5
ifupdown2: 3.2.0-1+pmx11
intel-microcode: 3.20250812.1~deb12u1
ksm-control-daemon: 1.5-1
libjs-extjs: 7.0.0-5
libknet1: 1.30-pve2
libproxmox-acme-perl: 1.6.0
libproxmox-backup-qemu0: 1.5.2
libproxmox-rs-perl: 0.3.5
libpve-access-control: 8.2.2
libpve-apiclient-perl: 3.3.2
libpve-cluster-api-perl: 8.1.2
libpve-cluster-perl: 8.1.2
libpve-common-perl: 8.3.4
libpve-guest-common-perl: 5.2.2
libpve-http-server-perl: 5.2.2
libpve-network-perl: 0.11.2
libpve-rs-perl: 0.9.4
libpve-storage-perl: 8.3.7
libspice-server1: 0.15.1-1
lvm2: 2.03.16-2
lxc-pve: 6.0.0-1
lxcfs: 6.0.0-pve2
novnc-pve: 1.6.0-2
proxmox-backup-client: 3.4.6-1
proxmox-backup-file-restore: 3.4.6-1
proxmox-backup-restore-image: 0.7.0
proxmox-firewall: 0.7.1
proxmox-kernel-helper: 8.1.4
proxmox-mail-forward: 0.3.3
proxmox-mini-journalreader: 1.5
proxmox-offline-mirror-helper: 0.6.8
proxmox-widget-toolkit: 4.3.13
pve-cluster: 8.1.2
pve-container: 5.3.3
pve-docs: 8.4.1
pve-edk2-firmware: 4.2025.02-4~bpo12+1
pve-esxi-import-tools: 0.7.4
pve-firewall: 5.1.2
pve-firmware: 3.16-3
pve-ha-manager: 4.0.7
pve-i18n: 3.4.5
pve-qemu-kvm: 9.2.0-7
pve-xtermjs: 5.5.0-2
qemu-server: 8.4.3
smartmontools: 7.3-pve1
spiceterm: 3.3.1
swtpm: 0.8.0+pve1
vncterm: 1.8.1
zfsutils-linux: 2.2.8-pve1
 
I have a problem with only one VM.
That VM for unknown reasons sometimes loses guest agent. This is pretty bad, because that makes also the backup impossible, since I do backups to PBS with stop mode.

Is there a known issue with this config?

I had it once before, did not think much of it and upgraded virtio tools to 0.1.285. It worked after the update for some time but know seems to act up again sporadically.
The probably strangest part is that it does not even work after a reboot sometimes.
Like right now, when I got to services, QEMU guest agent is not running. Even though it has Automatically as startup option. I can start it manually, no problem.

Windows is 25H2
QEMU is 0.1.285


Code:
proxmox-ve: 8.4.0 (running kernel: 6.8.12-15-pve)
pve-manager: 8.4.14 (running version: 8.4.14/b502d23c55afcba1)
proxmox-kernel-helper: 8.1.4
proxmox-kernel-6.8: 6.8.12-15
proxmox-kernel-6.8.12-15-pve-signed: 6.8.12-15
proxmox-kernel-6.8.12-13-pve-signed: 6.8.12-13
proxmox-kernel-6.8.12-11-pve-signed: 6.8.12-11
proxmox-kernel-6.8.4-2-pve-signed: 6.8.4-2
ceph-fuse: 17.2.8-pve2
corosync: 3.1.9-pve1
criu: 3.17.1-2+deb12u2
glusterfs-client: 10.3-5
ifupdown2: 3.2.0-1+pmx11
intel-microcode: 3.20250812.1~deb12u1
ksm-control-daemon: 1.5-1
libjs-extjs: 7.0.0-5
libknet1: 1.30-pve2
libproxmox-acme-perl: 1.6.0
libproxmox-backup-qemu0: 1.5.2
libproxmox-rs-perl: 0.3.5
libpve-access-control: 8.2.2
libpve-apiclient-perl: 3.3.2
libpve-cluster-api-perl: 8.1.2
libpve-cluster-perl: 8.1.2
libpve-common-perl: 8.3.4
libpve-guest-common-perl: 5.2.2
libpve-http-server-perl: 5.2.2
libpve-network-perl: 0.11.2
libpve-rs-perl: 0.9.4
libpve-storage-perl: 8.3.7
libspice-server1: 0.15.1-1
lvm2: 2.03.16-2
lxc-pve: 6.0.0-1
lxcfs: 6.0.0-pve2
novnc-pve: 1.6.0-2
proxmox-backup-client: 3.4.6-1
proxmox-backup-file-restore: 3.4.6-1
proxmox-backup-restore-image: 0.7.0
proxmox-firewall: 0.7.1
proxmox-kernel-helper: 8.1.4
proxmox-mail-forward: 0.3.3
proxmox-mini-journalreader: 1.5
proxmox-offline-mirror-helper: 0.6.8
proxmox-widget-toolkit: 4.3.13
pve-cluster: 8.1.2
pve-container: 5.3.3
pve-docs: 8.4.1
pve-edk2-firmware: 4.2025.02-4~bpo12+1
pve-esxi-import-tools: 0.7.4
pve-firewall: 5.1.2
pve-firmware: 3.16-3
pve-ha-manager: 4.0.7
pve-i18n: 3.4.5
pve-qemu-kvm: 9.2.0-7
pve-xtermjs: 5.5.0-2
qemu-server: 8.4.3
smartmontools: 7.3-pve1
spiceterm: 3.3.1
swtpm: 0.8.0+pve1
vncterm: 1.8.1
zfsutils-linux: 2.2.8-pve1

Hi,

i have no issues running Win11 25H2 on Proxmox 9.0.11 with Virtio Win guest tools - 0.1.285. -works perfectly for me. Also get to see the guest IP outside in the proxmox web interface (which happens only if the guest agent is working)

Edition Windows 11 Pro
Version 25H2
Installed on ‎11-‎11-‎2025
OS build 26200.7171
Experience Windows Feature Experience Pack 1000.26100.265.0
 
Does the Windows event log say anything when it stops/crashes?
Maybe :) I am not knowledgeable enough to use the right filters or knowing where to look. That is why was not able to find anything. Do you know where I should be looking? The linked powershell commands in the other thread did not find anything noticeable. My behavior is also slightly different, since I don't lose network conneciton.

i have no issues running Win11 25H2 on Proxmox 9.0.11
maybe it is time for me to upgrade then.
 
Last edited:
Maybe :) I am not knowledgeable enough to use the right filters or knowing where to look. That is why was not able to find anything. Do you know where I should be looking? The linked powershell commands in the other thread did not find anything noticeable. My behavior is also slightly different, since I don't lose network conneciton.


maybe it is time for me to upgrade then.
Yes, I suggest you do a clean install. Get the Latest Win11 ISO from the Microsoft Server and install the qemu 0.185 drivers and also remember to enable the qemu guest while making the new vm. it should work.
 
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