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Editorial Team
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Asked: 2026-05-13T21:21:43+00:00

I set up an ec2 instance. In the security group, I opened up SSH

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I set up an ec2 instance. In the security group, I opened up SSH ‘tcp’ port 80 for 0.0.0.0/0 (all open for testing purposes). I associated the instance with a private key. I downloaded the key and passed it while ssh-ing, but the RSA isn’t authenticating. Any ideas?

ssh -i mykey.pem root@mydnsinfo.amazonaws.com 

The authenticity of host 'mydns.amazonaws.com(IP)' can't be established. 
RSA key finger print is FINGERPRINT 
Are you sure you want to continue connecting (yes/no)?

Thank you in advance!!!

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1 Answer

  1. Editorial Team

    This is normal. Your SSH complains about the unknown host key. It always does when connecting to the new host for the first time. Just answer yes, connect and try again.
    It should not complain for the second time.

    The private key that you downloaded is for your ‘root’ account not for the whole host.

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