<![CDATA[Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3]]>Hi everyone,

I'm experiencing a strange issue with a freshly installed Windows 11 Pro 24H2 VM on my XCP-NG 8.3 host. The VM runs fine for some time but then randomly freezes. Here’s what happens:

  • The RAM usage graph in XOA freezes at the last recorded value.
  • CPU drops to 0% usage.
  • RDP disconnects and never comes back.
  • XOA console is completely frozen, making interaction impossible.
  • The VM still responds to ping (Uptime Kuma reports no ICMP downtime).
  • Trying to connect via RDP results in a loading screen for several minutes, but eventually fails.
  • It looks like the VM goes into some weird sleep/hibernation mode and won't wake up.
  • The only solution is a forced reboot via XOA/XCP-ng Center.
  • The Xen Tools are installed and up to date.

Does anyone have any idea what might be causing this? I'm completely stuck...

Here’s a graph showing the issue:

10d34f6c-08d5-4189-9c0a-77eb38430683-image.png

Thanks in advance for your help!

]]>https://xcp-ng.org/forum/topic/10559/windows-11-pro-24h2-vm-random-freezes-on-xcp-ng-8.3RSS for NodeSun, 06 Sep 2026 00:35:41 GMTSat, 01 Mar 2025 00:03:44 GMT60<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Wed, 14 May 2025 18:36:49 GMT]]>@AshleyDe
In the last few days, I've had these same issues with a few Server2025 virtual machines (I assume are close ish to Win11 24h2).

]]>https://xcp-ng.org/forum/post/92947https://xcp-ng.org/forum/post/92947Wed, 14 May 2025 18:36:49 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Tue, 13 May 2025 06:36:55 GMT]]>Ugh, RDP freezing up on Windows 11 24H2? That's a pain! It sounds like you're not alone, though. There's been some chatter about RDP acting a bit wonky after the 24H2 update.
From what I've seen, it might be related to how it handles network stuff, especially when reconnecting. Some folks have found that tweaking the network detection settings on the server side can help. It's a bit techy, but it involves going into the Local Group Policy Editor (type gpedit.msc in the Run dialog) and messing with the "Select network detection on the server" setting under Remote Desktop Services. You'd enable it and then tell it to turn off the "Connect Time Detect and Continuous Network Detect" options.
Alternatively, some people have had luck by messing with the Remote Desktop Connection settings on the client side, like setting the "Experience" tab to "WAN" instead of "Automatic" or even disabling the desktop wallpaper. It sounds weird, but sometimes those visual things can cause hiccups.
There's also talk about recent Windows updates causing some of these issues, so making sure you're on the very latest updates might have a fix baked in. Keep an eye out for any new patches from Microsoft.

If none of these solutions work, you can follow for more details instruction below.
https://thegeekpage.com/rdp-freezes-or-hangs-on-windows-11-24h2-how-to-fix/

]]>https://xcp-ng.org/forum/post/92856https://xcp-ng.org/forum/post/92856Tue, 13 May 2025 06:36:55 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Sat, 22 Mar 2025 17:20:43 GMT]]>@dinhngtu Hi everyone,

Thank you all so much for your help and suggestions. After several tests, I’ve decided to stop troubleshooting and stick with Windows 10 in BIOS mode. UEFI doesn’t work properly for me, whether with Windows 10 or 11, but everything runs fine in BIOS mode.

I really appreciate the time and support from this great community!

]]>https://xcp-ng.org/forum/post/91065https://xcp-ng.org/forum/post/91065Sat, 22 Mar 2025 17:20:43 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Fri, 21 Mar 2025 10:40:02 GMT]]>@DevilDan Windows 11 never fails to surprise... Can you try with Server 2025?

There's a specific timing needed to attach the debugger, refer to this thread: https://xcp-ng.org/forum/topic/10284/vm-failing-to-reboot

]]>https://xcp-ng.org/forum/post/91050https://xcp-ng.org/forum/post/91050Fri, 21 Mar 2025 10:40:02 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Fri, 21 Mar 2025 10:34:53 GMT]]>@DevilDan it boot after re-enabled secure boot, i set 2 cpu not 4 like before

]]>https://xcp-ng.org/forum/post/91049https://xcp-ng.org/forum/post/91049Fri, 21 Mar 2025 10:34:53 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Fri, 21 Mar 2025 10:32:11 GMT]]>@DevilDan

I roll back action, freeze always, I set 2 CPU (not 4) and now i have blue screen :

19b9f032-5f8f-4727-ae64-9f4c4294a228-image.png

]]>https://xcp-ng.org/forum/post/91048https://xcp-ng.org/forum/post/91048Fri, 21 Mar 2025 10:32:11 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Fri, 21 Mar 2025 10:18:00 GMT]]>@dinhngtu I try process, it freeze now at every boot :

e491b6a8-04bb-4b20-b838-415d6dffaf56-image.png

05d47530-f7db-4f75-8af0-bb359d6f94c2-image.png

59e733ed-c645-44ea-af3a-2dfd514989fd-image.png

3e3b5536-06d8-4b88-833b-e4cf33a0489d-image.png

]]>https://xcp-ng.org/forum/post/91047https://xcp-ng.org/forum/post/91047Fri, 21 Mar 2025 10:18:00 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Fri, 21 Mar 2025 09:50:14 GMT]]>@DevilDan It's only mandatory for the installation. Once it's installed you can disable secure boot and enable debugging.

]]>https://xcp-ng.org/forum/post/91045https://xcp-ng.org/forum/post/91045Fri, 21 Mar 2025 09:50:14 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Fri, 21 Mar 2025 09:44:22 GMT]]>@DevilDan I see, we have to disable secure boot, but it is mandatory for Win 11 NO ?

]]>https://xcp-ng.org/forum/post/91044https://xcp-ng.org/forum/post/91044Fri, 21 Mar 2025 09:44:22 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Fri, 21 Mar 2025 09:40:49 GMT]]>@dinhngtu You're right, in the first freezes, the CPU would drop to 0%. Now, in recent cases, one freeze spikes the CPU to 100% and then it drops, while another stays at 100%...

The VM still responds to ping for a while, but it eventually stops sometimes hours later. The console screen remains frozen on the Windows lock screen.

I'll look into your procedure and see if I can try it.

]]>https://xcp-ng.org/forum/post/91043https://xcp-ng.org/forum/post/91043Fri, 21 Mar 2025 09:40:49 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Fri, 21 Mar 2025 09:34:20 GMT]]>@DevilDan I noticed that in your earlier freezes, the CPU went to 0% but in these recent freezes the CPU is pegged to 100% instead. Does your guest still behave the same way during the freeze (no RDP/XOA console but still responding to ping)? It's an advanced process, but you can try attaching a kernel debugger and see what's happening. https://docs.xcp-ng.org/troubleshooting/windows-pv-tools/#connecting-to-guests-using-serial-console

]]>https://xcp-ng.org/forum/post/91042https://xcp-ng.org/forum/post/91042Fri, 21 Mar 2025 09:34:20 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Fri, 21 Mar 2025 09:27:53 GMT]]>@dinhngtu I had freeze on Win 10 UEFI mode, not in BIOS mode, I have only this example 😕 24H2 UEFI Bug, 23H2 UEFI Bug, Win 10 Uefi Bug, Windows 10 BIOS OK

]]>https://xcp-ng.org/forum/post/91040https://xcp-ng.org/forum/post/91040Fri, 21 Mar 2025 09:27:53 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Fri, 21 Mar 2025 09:26:44 GMT]]>@DevilDan Could you confirm that it's UEFI mode that's causing the problem?

]]>https://xcp-ng.org/forum/post/91039https://xcp-ng.org/forum/post/91039Fri, 21 Mar 2025 09:26:44 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Fri, 21 Mar 2025 09:11:16 GMT]]>@DevilDan

Console is... Frozen again..... I Think it's UEFI problem, Win 10 BIOS MODE no problem....

b2667ff0-ea9e-4ae9-9f90-dd4daa02e047-image.png

]]>https://xcp-ng.org/forum/post/91037https://xcp-ng.org/forum/post/91037Fri, 21 Mar 2025 09:11:16 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Thu, 20 Mar 2025 19:42:02 GMT]]>@DevilDan No bugs for the moment, PS : I choose the "other-media-install" template with all VM, maybe the static min memory is impacted finally ?

EDIT : 20 MARCH 2025 20H45 : always NO PROBLEM

]]>https://xcp-ng.org/forum/post/90958https://xcp-ng.org/forum/post/90958Thu, 20 Mar 2025 19:42:02 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Wed, 19 Mar 2025 12:38:56 GMT]]>@cirosantos0

Thanks! I changed this parameter yesterday, and everything is set to the exact same value down to the byte.

No bugs so far, but I did notice some CPU usage differences between Windows 10, Windows 11 23H2, and Windows 11 24H2. Only Windows 11 24H2 constantly consumes more CPU, staying between 6-10%, while the other versions peak between 0-3%. 24H2 is really bad...

That being said, the freezes don’t seem related to this. Let’s see if changing the static min RAM makes a difference. Would be great if it does! We’ll adjust accordingly.

]]>https://xcp-ng.org/forum/post/90935https://xcp-ng.org/forum/post/90935Wed, 19 Mar 2025 12:38:56 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Wed, 19 Mar 2025 12:10:40 GMT]]>@DevilDan Yeah, you cant change the static min in xoa, it has to be done through the cli

804bdce1-f56a-4353-b91d-bdd9f4fde4f4-image.png

xe vm-memory-limits-set static-min=8GiB static-max=8GiB dynamic-min=8GiB dynamic-max=8GiB uuid=xxxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx

This is what i did, but like you said, the documentation says i makes no difference.

]]>https://xcp-ng.org/forum/post/90933https://xcp-ng.org/forum/post/90933Wed, 19 Mar 2025 12:10:40 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Tue, 18 Mar 2025 20:22:15 GMT]]>@cirosantos0 @Danp @dinhngtu

Thanks for your feedback!

I usually always set the Dynamic and Static memory limits to the same value because I don't like auto-scaling based on load. I prefer to allocate the actual possible usage. I've attached a screenshot of my RAM configuration; since I'm not very familiar with Xen Orchestra, I just want to confirm that this setup is correct. Normally, I've set both the minimum and maximum dynamic memory to 8GB, as well as the static memory.

2839e892-ce71-4fd4-bd93-7e98ff64312a-image.png

So far, my Windows 10 VM (BIOS) hasn’t had any issues, but the Windows 11 VM (UEFI) still seems to freeze. I’ll double-check, but it looks like the problem is really related to UEFI.

Also, I can't edit the static min memory value in XOA, and I don't know why. Is this the expected behavior?

Just to be sure, I'll set the static min memory to 8GB (in CLI on XCP-NG console) and observe the behavior, even though the documentation suggests it shouldn't make any difference.

]]>https://xcp-ng.org/forum/post/90915https://xcp-ng.org/forum/post/90915Tue, 18 Mar 2025 20:22:15 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Tue, 18 Mar 2025 13:35:27 GMT]]>@DevilDan
We had a similar problem when we tested version 8.3. In our case, it was related to the memory limits of the VMs.

In 8.2, setting different values for Dynamic and Static memory caused a bluescreen.
In 8.3, Windows Server VMs sometimes bluescreened, while both Windows Desktop and Server VMs occasionally froze as you described.

Our VMs were not fresh installs, but we resolved the issue by setting the Dynamic and Static memory limits to the same value (both min and max).

Please do try to see if it solves your problem.

]]>https://xcp-ng.org/forum/post/90903https://xcp-ng.org/forum/post/90903Tue, 18 Mar 2025 13:35:27 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Mon, 17 Mar 2025 10:47:09 GMT]]>@dinhngtu
I also remember having installation issues and freezes with PFsense VMs or performance slowdowns with OPNSense in UEFI mode, I think. It feels like UEFI isn't that great?

]]>https://xcp-ng.org/forum/post/90854https://xcp-ng.org/forum/post/90854Mon, 17 Mar 2025 10:47:09 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Mon, 17 Mar 2025 10:36:28 GMT]]>@dinhngtu

No issues on Linux VMs, the problem only occurs on Windows 11 24H2, 23H2 (so far) and Windows 10, all running in UEFI mode.

  • No issues so far on a new Windows 10 VM running in BIOS mode.
  • I'm always installing Xen Guest drivers 9.4 (we also tested without them).
  • The VMs have nothing special installed, it's just a clean Windows setup.
  • I don't remember if the issue appeared on both Windows versions at the same time, so I can't confirm a correlation, but it's a possibility.
  • I had some "coalesce" issues on another Linux VM, but that's been resolved, and it doesn't seem related.
  • I already tested both Intel and Realtek NIC models, same issue. However, I'll switch everything back to Realtek just in case.
  • Currently, I have a Windows 11 24H2 VM and a Windows 10 VM (I deleted Windows 11 23H2—it was the most stable and used less CPU than 24H2, but since I'm testing, I'll stick with 24H2).
]]>https://xcp-ng.org/forum/post/90853https://xcp-ng.org/forum/post/90853Mon, 17 Mar 2025 10:36:28 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Mon, 17 Mar 2025 10:08:19 GMT]]>@DevilDan If the problem shows up on older Windows versions I would start suspecting a few other factors.

  • Do you have any Windows PV drivers installed?
  • Could you switch back to the Realtek NIC model instead of Intel e1000?
  • Does it happen on all VMs at once or just one VM at a time?
  • Any issues with Linux distros?
]]>https://xcp-ng.org/forum/post/90852https://xcp-ng.org/forum/post/90852Mon, 17 Mar 2025 10:08:19 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Sun, 16 Mar 2025 21:52:01 GMT]]>@Danp @dinhngtu Hi, today I will try Win 10 22H2 latest. Maybe it is the vtpm and uefi secure boot the problem ? I have a freeze at boot on DVD when asking Product Key, i restart install, with VTPM and UEFI + secure boot, loike Win 11, we will see

Edit : CPU instable, after freeze, I try in BIOS mode with no VTPM

]]>https://xcp-ng.org/forum/post/90844https://xcp-ng.org/forum/post/90844Sun, 16 Mar 2025 21:52:01 GMT<![CDATA[Reply to Windows 11 Pro 24H2 VM Random Freezes on XCP-NG 8.3 on Fri, 14 Mar 2025 14:29:48 GMT]]>@dinhngtu It's not the software, the problem is back again 🎃 🎃 🎃 🎃 🎃 🎃

d0b27630-6669-4074-9b96-9d80b92fb1d4-image.png

]]>https://xcp-ng.org/forum/post/90754https://xcp-ng.org/forum/post/90754Fri, 14 Mar 2025 14:29:48 GMT