Azure Virtual Desktop Session host is unavailable.

Question

Azure Virtual Desktop Session host is unavailable.

Mohan Randeniya 40

We cannot connect to Azure Virtual Desktops, even if we create one from the beginning. Please help us find the root cause of this issue and resolve it 2025-09-03 00_45_36-WIA-AzureVD-0 - Microsoft Azure and 8 more pages - Work - Microsoft Edge

2025-09-03 00_46_23-WIA-AzureVD-0 - Microsoft Azure and 8 more pages - Work - Microsoft Edge

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JimmySalian-2011 44,721 Reputation points

2025-09-03T17:52:35.4666667+00:00

Hi,

Not sure what steps you have taken to deploy the AVD, however I would recommend to follow the guidelines here - https://dori-uw-1.kuma-moon.com/en-us/azure/virtual-desktop/deploy-azure-virtual-desktop?tabs=portal-standard%2Cportal-session-host-configuration%2Cportal&pivots=host-pool-standard

Also troubleshoot steps for this kind of issue - enable insights to drill down the issues on the AVD Infra - https://dori-uw-1.kuma-moon.com/en-us/azure/virtual-desktop/insights

Hope this helps.

JS

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Mohan Randeniya 40 Reputation points

2025-09-03T19:42:50.89+00:00

I have used this document to create the AVD. But I am still receiving the same issue.

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JimmySalian-2011 44,721 Reputation points

2025-09-03T17:52:35.4666667+00:00

Hi,

Not sure what steps you have taken to deploy the AVD, however I would recommend to follow the guidelines here - https://dori-uw-1.kuma-moon.com/en-us/azure/virtual-desktop/deploy-azure-virtual-desktop?tabs=portal-standard%2Cportal-session-host-configuration%2Cportal&pivots=host-pool-standard

Also troubleshoot steps for this kind of issue - enable insights to drill down the issues on the AVD Infra - https://dori-uw-1.kuma-moon.com/en-us/azure/virtual-desktop/insights

Hope this helps.

JS

==
Mohan Randeniya 40 Reputation points

2025-09-03T19:42:50.89+00:00

I have used this document to create the AVD. But I am still receiving the same issue.

Answer 1

Dear Mohan Randeniya,

This issue may be related to agent registration failures, network configuration, or missing permissions. We recommend reviewing the session host logs in Event Viewer under WVD-Agent, RDAgentBootLoader, or MsiInstaller for any errors such as INVALID_REGISTRATION_TOKEN or service startup failures. Additionally, please verify that the session hosts are correctly joined to Azure AD or your domain, and that required ports (TCP 443, UDP 3391) are open.

If you're using custom images or templates, ensure the Azure Virtual Desktop agent and boot loader are properly installed and running. We also suggest checking Azure Service Health and confirming that your subscription has sufficient resources and quotas.

If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.

Best regards,

Harry Phan

Mohan Randeniya 40 Reputation points

2025-09-08T17:04:34.82+00:00

Hi, thank you for your response. With your instructions, I fixed the issue.

Login to the Azure Virtual Machine that created for the Azure VD.

Join the domain manually and restart the device.

The created Azure VD did not automatically join to the domain. So, we have to do it manually if that happens.

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Azure Virtual Desktop Session host is unavailable.

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