Cannot SSH to instance & How to connect to the ATP from linux

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Problem: I am getting error when I try to SSH to the instance from Mac computer.

IP address and the user id that I am using were provided on the Instance Detail page under the Instance Access column on the Cloud Infrastructure. I have also uploaded the pub key to the instance.

I enter command:

$ ssh -i pub_key user@instance ip address

Error: user@instance ip address: Permission denied ( publickey.gssapi-keyex.gssapi-with-mic)

Any help would be appreciated.  

Also, how do I connect to the ATP DB that I created on the oracle cloud.  I am signed up to the free account.