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