No supported authentication methods available (server sent: publickey)

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PuTTY Fatal Error
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PuTTY Fatal Error Disconnected: No supported authentication methods available (server sent: publickey)
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Scenario : 
Error while connecting to AWS AMI Instance using PuTTy.


Solution:
in my case "admin" user worked.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/TroubleshootingInstancesConnecting.html#TroubleshootingInstancesConnectingPuTTY

Docker Error :In the default daemon configuration on Windows, the docker client must be run elevated to connect

error during connect: Post http://%2F%2F.%2Fpipe%2Fdocker_engine/v1.40/auth: open //./pipe/docker_engine: The system cannot find the file specified. In the default daemon configuration on Windows, the docker client must be run elevated to connect. This error may also indicate that the docker daemon is not running.

Fix :

Try one of these:

First :https://success.docker.com/article/docker-for-windows-fails-with-a-daemon-not-running-message

Second:

Dun docker service with elevated privilege. This error shows up when docker service  is not running. Make sure you docker dashboard shows as "running"