After creating an ec2 windows machine from a custom AMI. I am able to get the admin password. However when I try to login to the machine.
I get the RDP error saying 'An authentication error has occurred. The local security authority cannot be contacted. This could be due to an expired password.'
The password isn't expired and there is no issue with the AMI as when I create another instance from the same it works fine.
When I turned off NLA on the Host server I was able to login, but obviously that's not a reasonable answer.
Turned out to be BitDefender, once I turned off protection I could connect to all my EC2 VMS.
-Just a note for me. This was only blocking VMS I was connecting to through ec2 Public DNS.