I have added an EC2 cloud with the intention of using Windows instances.
The Windows AMI is configured to use SSH connection, not WinRM.
When I provision a Windows instance, I see it starting in the AWS console, 
and I see this in the Jenkins console:

May 07, 2021 5:45:42 PM INFO hudson.plugins.ec2.EC2Cloud log
Connecting to ec2-18-197-156-192.eu-central-1.compute.amazonaws.com on port 
22, with timeout 10000.
May 07, 2021 5:45:52 PM INFO hudson.plugins.ec2.EC2Cloud log
Failed to connect via ssh: The kexTimeout (10000 ms) expired.
May 07, 2021 5:45:52 PM INFO hudson.plugins.ec2.EC2Cloud log
Waiting for SSH to come up. Sleeping 5.
May 07, 2021 5:45:57 PM INFO hudson.plugins.ec2.EC2Cloud log
Connecting to ec2-18-197-156-192.eu-central-1.compute.amazonaws.com on port 
22, with timeout 10000.
May 07, 2021 5:45:57 PM INFO hudson.plugins.ec2.EC2Cloud log
Failed to connect via ssh: There was a problem while connecting to 
ec2-18-197-156-192.eu-central-1.compute.amazonaws.com:22
May 07, 2021 5:45:57 PM INFO hudson.plugins.ec2.EC2Cloud log
Waiting for SSH to come up. Sleeping 5.

(repeat many times)
This is normal of course, as long as the instance is still starting.

After a while, I see in the AWS console that the instance is Running.
And immediately, it gets terminated.

I also see this in the Jenkins log, which may or may not be relevant:

May 07, 2021 5:50:52 PM INFO hudson.plugins.ec2.EC2OndemandSlave 
lambda$terminate$0
Terminated EC2 instance (terminated): i-0c82439628de13743
May 07, 2021 5:50:52 PM INFO hudson.plugins.ec2.EC2OndemandSlave 
lambda$terminate$0
Removed EC2 instance from jenkins master: i-0c82439628de13743

I may add more log snippets as I try to figure this out.

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