This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(121.6, 54%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESC%3C/text%3E%3C/svg%3E)
We're having a problem with a Windows Server 2025 Hyper-V cluster.
We have 2 identical clusters (same hardware, same BIOS version) and when we move a Windows 2012R2 VM from one cluster to another it does not boot any more (tested with 2 different VM's).
The error is a blue screen 0x7B (INACCESSIBLE_BOOT_DEVICE).
If we move the machine back to the other cluster it boots just fine.
Only difference I see is the cluster path level. The working cluster is an older Windows Update (KB5058411, KB5058523 and KB5054979).
Whereas the newer cluster has KB5063666, KB5062553, KB5056579 and KB5059502. It tried installing KB5064489 also, but that does not help.
A VM with Windows server 2022 of 2025 does move fine, so it seems to be linked to 2012R2.
I also tried to install a brand new 2012R2 VM from the original iso and then completely upgrading it with Windows Update and that machine is working fine. It seems to have the same verson of storage drivers as the non working VM.
The faulting VM does boot succesfully into recovery mode. I tried bootrec /fixmbr and bootrec /fixboot, but that does not help.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(313.6, 76%, 40%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ET%3C/text%3E%3C/svg%3E)
Same issue here. Sadly I could not pin down the exact faulty update!
but thanks for your direction!
Thought, I killed my VM. Even the back up…. :D
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(252.8, 4%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EPS%3C/text%3E%3C/svg%3E)
I have a customer with the exact same issue. Windows Server 2025 S2D Cluster. After applying the last Updates, a Restart of the running Win 2012R2 VMs will boot into recovery. Things i already testet:
VM ist configversion 12
On another Server 2025 S2D cluster with older updates, the same VM is booting
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(268.8, 18%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAB%3C/text%3E%3C/svg%3E)
We need to identify which CU caused the problem now. I'll try that on my freshly built nested hypervisor.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(252.8, 68%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EKT%3C/text%3E%3C/svg%3E)
hi guys, the customer had a same problem:
Failover Cluster 2025 with 3 identical nodes, we uninstall the (KB5060842) from the one node and reboot it, after we migrate the affected VM (WS2012R2) back to the node and VM boot succesfully.
post about this issue on my blog:
https://tomaskalabis.com/wordpress/problem-booting-windows-2012r2-vm-on-windows-2025-hyper-v/
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(307.2, 40%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EPS%3C/text%3E%3C/svg%3E)
Still waiting for MS to response to the opened case...hope they will respond soon...
did you have installed KB5060842 on your hyperv node ?
yes, same issue
as i said, we uninstall the on the one node, move affected vm on node, where the KB5060842 was uninstalled and vm came up in secconds. (also check the TPM) :)
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(307.2, 79%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESC%3C/text%3E%3C/svg%3E)
Also opened a case with MS last Thursday, no first response yet (just a case number).
stefan, did you have installed a KB5060842 on the problematic node ?
Yes, as tested above the KB5060842 is where the problem starts.
"After applying KB5058411 (May 13) the 2012R2 VM boots succesfully.
After applying KB5060842 (Jun 10) the 2012R2 VM does not boot any more.
So the cause is in KB5060842."
Still have a case open with Microsoft. The engineer spent a couple of hours with me trying a lot of things, but no joy.
Then I got the '2012R2 is no longer supported' answer.
With the help of our local Microsoft contact we are now trying to get the case escalated arguing the problem is in Windows 2025 and not in 2012R2.
I'll keep you posted as soon as I get more news.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(272, 5%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBG%3C/text%3E%3C/svg%3E)
We have this same or similar issue although not a cluster.
Windows 2025 server - Moved 3x Windows 2012 R2 VMs to it back in April time - They are archival manual boot access for old accounts system. Worked fine at time. Later tried to boot and they all fail. Restores from backup failed, new export and import fails etc which lead me here.
The tweaks to Storsvc recommended along with a new export didnt work for me.
I don't seem to have any of the updates listed however maybe they were bundled into a cumulative update.
At the point now of bringing a previous 2019 host online again to host these VMs if 2025 isnt going to play ball with them unless a fix comes along soon.
try to run this comman in ps:
Get-HotFix -Id KB5060842
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(172.8, 72%, 26%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDI%3C/text%3E%3C/svg%3E)
Same scenario here, KB5060842 NOT installed and vm not booting.
Only those 3 hotfix are installed:
what about try to uninstall KB5063666 ? - the security update.
did you have resoruce to try it ?
these are my updates
in terms of removal I would have to wait until the weekend to test it. Although i'm never a huge fan of removing or blocking an update if it affects something else adversely or leaves a security risk.
These are cummulative updates, so the problem is in any of the later updates too. Starts with KB5062553 but also present in later updates KB5064489 and KB5062660.
Still no engineer assigned on Microsoft support ticket. Got assigned an Escalation Support Manager though. Hope to get a reaction soon now.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(275.2, 98%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EDL%3C/text%3E%3C/svg%3E)
Same for me. I tried the registry keys and no dice. Then I tried the other suggestion of adding and removing a storage adapter and when I brought the 2012 R2 machine back up, it started boot looping the same as well, but on the 2016 cluster now. Fortunately, it was a clone of the production machine.
Okay, so I have a 2025 3-node cluster. I'm coming from a 2016 cluster. Server 2012 R2 VM was blue screening on boot until I removed KB5060842 from one of the hosts. With that KB removed, VM boots up perfectly fine. I'm going to roll back to my 2016 cluster for the time being until there is a good solution that doesn't involve uninstalling/blocking an update, but that worked perfectly for me. The other suggestions haven't worked at all for me.
Yes Derek, same issue as in the cluster of my customer. remove of KB5060842 helps !
https://tomaskalabis.com/wordpress/problem-booting-windows-2012r2-vm-on-windows-2025-hyper-v/
I have a fix that seems to work for my 2012R2.
After more testing with MS support, the support engineer suggested to do an inline repair :
After that my 2012R2 VM booted fine on a patched Windows Server 2025.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(233.6, 17%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EH%3C/text%3E%3C/svg%3E)
Hi, tried this and was able to bring up my 2012R2 Essentials VM on an unpatched Server 2025 host. However, when I try to do the “upgrade” I get an error that says Server 2012R2 Essentials cannot be upgraded to Server 2012R2 Essentials. Maybe this is specific to the Essentials version. So hopefully, another workaround will be found! Thank you.
