I have a few AVD hosts that both failed at the same time and I can't get them to start

Question

I have a few AVD hosts that both failed at the same time and I can't get them to start

Mantis83 0

I see this error message "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." I've enabled boot diagnostics, but that hasn't shown anything yet. I tried reapply/redeploy and that didn't help. Redeploy actually failed eventually. I don't know what else to try. I've really new to hosting anything in Azure and these hosts that have failed are part of an AVD proof of concept project.

Suggestions?

Thanks!

Sudheer Reddy 2,055 Reputation points Microsoft External Staff Moderator

2025-06-11T05:50:02.72+00:00

Hi Mantis83,

As session host VMs in Azure are also linked to physical hosts and from time to time there may be some outages if there is no High Availability. https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/understand-vm-reboot#host-server-faults

Try redeploying the AVD session host again after some time if the initial attempt fails.

If reapply/redeploy fails, try Azure Backup or snapshots to restore the affected VMs or their disks to new instances. https://techcommunity.microsoft.com/blog/azurevirtualdesktopblog/recovery-options-for-azure-virtual-desktop-session-host-vms/4199012

Review the Azure Service Health dashboard for outages or incidents affecting your region. https://azure.status.microsoft/en-us/status

If you have any queries, please do let us know, we will help you.
Mantis83 0 Reputation points

2025-06-11T13:43:41.37+00:00

There are no outages when I looked at the status. I've already tried re-deploying but that eventually fails. This has been an issue since last Friday. Am I to believe that Microsoft doesn't have this host fixed after about 5 days of it being down?
Sudheer Reddy 2,055 Reputation points Microsoft External Staff Moderator

2025-06-12T06:33:41.15+00:00

Hi Mantis83,

Thanks for the reply.

Are there any specific error messages displayed when you attempt to start the Session host VMs?

From how long you are facing the issue unable to start and in which region the Session host VMs is deployed.

1 answer

Your answer

Sudheer Reddy 2,055 Reputation points Microsoft External Staff Moderator

2025-06-11T05:50:02.72+00:00

Hi Mantis83,

As session host VMs in Azure are also linked to physical hosts and from time to time there may be some outages if there is no High Availability. https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/windows/understand-vm-reboot#host-server-faults

Try redeploying the AVD session host again after some time if the initial attempt fails.

If reapply/redeploy fails, try Azure Backup or snapshots to restore the affected VMs or their disks to new instances. https://techcommunity.microsoft.com/blog/azurevirtualdesktopblog/recovery-options-for-azure-virtual-desktop-session-host-vms/4199012

Review the Azure Service Health dashboard for outages or incidents affecting your region. https://azure.status.microsoft/en-us/status

If you have any queries, please do let us know, we will help you.
Mantis83 0 Reputation points

2025-06-11T13:43:41.37+00:00

There are no outages when I looked at the status. I've already tried re-deploying but that eventually fails. This has been an issue since last Friday. Am I to believe that Microsoft doesn't have this host fixed after about 5 days of it being down?
Sudheer Reddy 2,055 Reputation points Microsoft External Staff Moderator

2025-06-12T06:33:41.15+00:00

Hi Mantis83,

Thanks for the reply.

Are there any specific error messages displayed when you attempt to start the Session host VMs?

From how long you are facing the issue unable to start and in which region the Session host VMs is deployed.

Answer 1

You can add public IP for testing and open tcp 3389 port and try connect the VM directly with RDP. That way you understand, does VM work or not.

You can also run remote scripts for troubleshooting AVD services like:

  *Get-Service RDAgent, RDAgentBootLoader | Select Name, Status*

If AVD VM's content is not important, just kill them and redeploy new one. Not all VM sizes are compatible with different zones/regions. If you fail during deployment of new AVD VM, you should be able to see the reasoning behind json text (after failure occures).

Share via

I have a few AVD hosts that both failed at the same time and I can't get them to start

1 answer

Your answer