Unable to restart Virtual machines

Question

Unable to restart Virtual machines

Chandra 0

Couple of windows Virtual machines in my subscription having this issue while starting.

Unavailable (Unplanned)

We're sorry, your virtual machine isn't available because an unexpected failure on the host server. An unexpected problem with the host is preventing us from automatically recovering your virtual machine.

Massimo Marchi 0 Reputation points

2025-06-12T10:09:30.7+00:00

We're facing the same issue in EAST US (Zone 1):

Only 3 Virtual Machines are affected for now, but the issues is ongoing for atleast 3 hours at this point
Nikhil Duserla 7,935 Reputation points Microsoft External Staff Moderator

2025-06-19T10:11:31.5066667+00:00

Hello @Chandra,

Checking to see whether you have resolved the issue with the solution provided above, or if you need any further assistance, please let us know. We are happy to help.

1 answer

Your answer

Massimo Marchi 0 Reputation points

2025-06-12T10:09:30.7+00:00

We're facing the same issue in EAST US (Zone 1):

Only 3 Virtual Machines are affected for now, but the issues is ongoing for atleast 3 hours at this point
Nikhil Duserla 7,935 Reputation points Microsoft External Staff Moderator

2025-06-19T10:11:31.5066667+00:00

Hello @Chandra,

Checking to see whether you have resolved the issue with the solution provided above, or if you need any further assistance, please let us know. We are happy to help.

Answer 1

Nikhil Duserla 7,935 Microsoft External Staff Moderator

Hello @Chandra,

I’m currently checking with our team regarding this issue. In the meantime, please try the following steps:

If your VM is stuck in the Updating state, unable to restart or not able to access, try restarting it through the Azure Portal or use PowerShell to refresh its state.

If the VM is still not running after a restart, consider redeploying it from the Azure Portal.

If you're currently using a v6-series VM, try resizing it to a v4 or v5 series and then verify whether the VM is running.

Additionally, make sure that TPM (Trusted Platform Module) is disabled, as this could impact the VM's functionality and check the VM status.

Note-

If you have resized the VM size or disk configuration, try reverting to the previous size after a few hours to see if that resolves the issue.

Thank you!

Nikhil Duserla 7,935 Reputation points Microsoft External Staff Moderator

2025-06-17T17:20:48.8133333+00:00

Hello @Chandra,

Thank you for your patience while we investigated the issue. Our team has confirmed that it has now been fully resolved.

The root cause was identified as a firmware misconfiguration in Underhill VMs, which resulted in TPM-related file corruption and VM failures. A hotfix has been applied to prevent this issue in all newly created v6 VMs. For existing affected VMs, the recommended steps are to either disable the vTPM and restart the VM or recreate the VM.

A permanent fix was deployed on June 16, 2025, at 4:00 AM UTC. Customers have been informed and can now safely re-enable the vTPM where applicable.

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Unable to restart Virtual machines

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