Unable to Connect To Azure VM after Swapping OS Disk

Question

I am having issues connecting one of our VMs.
First, it takes forever (hours) to complete the start sequence. It says running, but the notifications says Starting virtual machine ...

When trying to connect using RDP, getting the below error.

If I disable that, I am still getting an error that the account cannot be authenticated, which preventing me and everyone else to log on.

I do have an automation set up that swaps the OS disk overnight that is being created each night from a snapshot that was taken months ago. So we have the same machine regardless of changes during our demos.

Any advise on what I should do to make the machine accessible?

Answer 1

After swapping OS disk, the resource ID should be updated. If you are not following that, make sure to do that.
Folowing is an example PowerShell script.

# Get the VM   
$vm = Get-AzVM -ResourceGroupName myResourceGroup -Name myVM   
  
# (Optional) Stop/ deallocate the VM  
Stop-AzVM -ResourceGroupName myResourceGroup -Name $vm.Name -Force  
  
# Get the new disk that you want to swap in  
$disk = Get-AzDisk -ResourceGroupName myResourceGroup -Name newDisk  
  
# Set the VM configuration to point to the new disk    
Set-AzVMOSDisk -VM $vm -ManagedDiskId $disk.Id -Name $disk.Name   
  
# Update the VM with the new OS disk  
Update-AzVM -ResourceGroupName myResourceGroup -VM $vm   
  
# Start the VM  
Start-AzVM -Name $vm.Name -ResourceGroupName myResourceGroup  

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Answer 2

The reasons for NLA issues are as follows:

When you swap the disk, the account properties are refreshing and can be a strong reason here:

The VM has an old copy of the account password, and the DC has a newer cop

Make sure that, you are avoiding all the points indicated.

In-order to bring the VM back, you can follow the troubleshooting steps explained here: cannot-connect-rdp-azure-vm

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--please don't forget to upvote and Accept as answer if the reply is helpful--