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AWS Permission denied (publickey,gssapi-keyex,gssapi-with-mic)

I was trying to connect to an ec2 instance using ssh and kept getting this error:
Permission denied (publickey,gssapi-keyex,gssapi-with-mic)

The fix was to login using "ec2-user" username as follows;
ssh -i <cert.pem> ec2-user@<public-DNS>

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