Azure Arc Update management error : cannot validate some machines for Update Management solution use.

GaonNuri 21 Reputation points

Hello I'm GaonNuri

I use Azure Arc Server enabled EC2 Instance(ubuntu20.04, AmazonLinux)
When I used 'Update Deployment Reservation', the following error was occurred.


Exactly, EC2 Instance Server(ubuntu20.04, AmazonLinux) can use update management Reservation.

But, I don't know why this error is occurred.
There is no document about this error anywhere.

please let me know the reason.

Azure Arc
Azure Arc
A Microsoft cloud service that enables deployment of Azure services across hybrid and multicloud environments.
337 questions
0 comments No comments
{count} votes

1 answer

Sort by: Most helpful
  1. tbgangav-MSFT 10,386 Reputation points

    Hi @GaonNuri ,

    I understand that you are trying to schedule an update deployment but looking at the error there might be various reasons for it. So, I would recommend to double check if

    1. the machine has been turned off by any chance
    2. the machine is successfully registered and connected to Azure Automation or not
    3. the scheduling of update deployment is tried from 'Update management' tile of Azure Automation account because machine is registered with Azure Arc-enabled servers
    4. disconnecting and reconnecting the machine after re-enabling update management would overcome the error or not

    If none of the above validations helps to resolve the error then to try diagnosing and troubleshooting the cause of the issue it would require deep dive with the help of related troubleshooter logs and traces so for that I would recommend to raise an Azure technical support request if you have a support plan. But if you don't have a support plan then please send an email to with subject being "Attn:Krishna" and your subscription ID and this question's link in the body of the email so that my team can work with you via our technical support channel.