Azure Virtual Machines
An Azure service that is used to provision Windows and Linux virtual machines.
7,586 questions
Accessing Linux VM using Serial Console
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Stewart Marks
1
Reputation point
We have a Linux VM (Ubuntu) in Azure. We are now unable to connect via RDP (RDP installed on OS) or SSH.
When going to boot diagnostics we are seeing an FSTAB error.
I have enabled serial console with a 'custom storage account'. I selected 'create new' for this option.
When attempting to connect via serial console, we receive the below error message:
The serial console connection to the VM encountered an error: 'Bad Request'
(400) - The storage account 'u-----------g' used for boot diagnostics on this VM could not be found. Verify that boot diagnostics is enabled for this VM, this storage account has not been deleted, and you have access to this storage account.
I can confirm that my user account has the correct permissions, boot diagnostics is enabled and the storage account exists.
I have already gone through Azure Storage Explorer, obtained the URL and used the below PS command, with no luck (the command executes successfully, but no change:
az vm boot-diagnostics enable --name vmName --resource-group rgName --storage https://<storageAccountUri>.blob.core.windows.net/
Can someone please advise next steps? Does the storage account need to be configured specially?
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kobulloc-MSFT 26,131 Reputation points Microsoft Employee2022-04-19T16:59:54.617+00:00 @Stewart Marks , is the custom storage account in the same region as your VM and accessible from all networks? (You can check the Networking section of the storage account Overview page.)
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Stewart Marks 1 Reputation point
2022-04-19T20:03:33.323+00:00 @ kobulloc-MSFT , I can confirm yes to both these questions. Is there anything I need to do to the VM security wise to allow it to allow the serial connection access?
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kobulloc-MSFT 26,131 Reputation points Microsoft Employee
2022-04-19T20:29:39.923+00:00 @Stewart Marks , it should be available with an access role of at least Contributor or higher for both the VM and the boot diagnostics storage account. I'm going to look into this a bit more.
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