Might work through this one.
https://learn.microsoft.com/en-us/troubleshoot/windows-server/remote/cannot-connect-rds-no-license-server
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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After the upgrade of AWS EC2 Windows Server, there is a remote connection problem and the system is not activated. What should I do? Do I need the key to reactivate the system?
Might work through this one.
https://learn.microsoft.com/en-us/troubleshoot/windows-server/remote/cannot-connect-rds-no-license-server
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
Hello @cruise
Since this is a behavior produced after the upgrade of the system in Amazon Web Services, and no changes were made to the Windows system, you should direct the question to an Amazon Web Services Forum, as their community would be more experience in the effects of this changes and how to resolve it.
Hope this helps with your query,
--
--If the reply is helpful, please Upvote and Accept as answer--