I am working on EC2 client. I have setup user account and respected public/private key for SSH login. It was working fine. Today I had to install ftp so that I can upload files through filezilla. SO instead of creating new user for vsftpd I setup password for same user (user which I was using for SSH). Now I am able to access FTP using same credentials but my SSH login is failed. It throws me error as "Disconnected: No suppoerted authentication methods available (server sent: publickey)". Now I am not able to access my ec2 instance using SSH at all.
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