How to fix "VM has reported a failure when processing extension 'Microsoft.PowerShell.DSC' (publisher 'Microsoft.Powershell' and type 'DSC'). Error message: 'The DSC Extension failed to execute: Error downloading" in Azure VDI Deployment

Question

Hello,

We've encountered an issue with our Azure VDI deployment, resulting in an error that seems to be affecting the Host pool. This, in turn, is causing VMs to fail multiple checks.
 

The error message we received is as follows:

{     "status": "Failed",     "error": {         "code": "DeploymentFailed",         "message": "At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.",         "details": [             {                 "code": "Conflict",                 "message": "{\r\n  \"status\": \"Failed\",\r\n  \"error\": {\r\n    \"code\": \"ResourceDeploymentFailure\",\r\n    \"message\": \"The resource write operation failed to complete successfully, because it reached terminal provisioning state 'Failed'.\",\r\n    \"details\": [\r\n      {\r\n        \"code\": \"VMExtensionProvisioningError\",\r\n        \"message\": \"VM has reported a failure when processing extension 'Microsoft.PowerShell.DSC' (publisher 'Microsoft.Powershell' and type 'DSC'). Error message: 'The DSC Extension failed to execute: Error downloading https://wvdportalstorageblob.blob.core.windows.net/galleryartifacts/Configuration_1.0.02599.267.zip after 17 attempts: The underlying connection was closed: An unexpected error occurred on a send..\\r\\nMore information about the failure can be found in the logs located under 'C:\\\\WindowsAzure\\\\Logs\\\\Plugins\\\\Microsoft.Powershell.DSC\\\\2.83.5' on the VM.'. More information on troubleshooting is available at https://aka.ms/VMExtensionDSCWindowsTroubleshoot. \"\r\n      }\r\n    ]\r\n  }\r\n}"             }         ]     } }
 
 
{   "code": "DeploymentFailed",   "target": "/subscriptions/40422de8-2c9b-4a1b-bc56-246fa16ee541/resourceGroups/avdpoc-infra-pro-chn-rg/providers/Microsoft.Resources/deployments/AddVMsToHostPool-9227b4c0-1d68-4260-af51-e8234ebe10c4-deployment",   "message": "At least one resource deployment operation failed. Please list deployment operations for details. Please see https://aka.ms/arm-deployment-operations for usage details.",   "details": [     {       "code": "ResourceDeploymentFailure",       "target": "/subscriptions/40422de8-2c9b-4a1b-bc56-246fa16ee541/resourceGroups/avdpoc-infra-pro-chn-rg/providers/Microsoft.Resources/deployments/vmCreation-linkedTemplate-9227b4c0-1d68-4260-af51-e8234ebe10c4",       "message": "The resource write operation failed to complete successfully, because it reached terminal provisioning state 'Failed'."     }   ] }

could you please help me to fix this problem
Thanks
Salem

Answer 1

@Salem Elaiba

According to the error you are receiving the VM is unable to reach the URL:

https://wvdportalstorageblob.blob.core.windows.net/galleryartifacts/Configuration_1.0.02599.267.zip

Which is required to provision the Virtual Desktop Service. You can review the required endpoints here. Please verify that your Network Security Group is allowing outbound traffic and not blocking this endpoint.

If you are still facing issues please let me know and we can work with you directly to further troubleshoot.

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