SSH key exchange is not working

ssh

Is there any way to verify why SSH key exchange between 2 servers is not working?

In Server A:
I did the following steps: 

ssh-keygen –t rsa
cd /.ssh
cp id_rsa.pub authorized_keys

Then in Server B:
I created the .ssh directory and uploaded the authorized_keys from Server A

I tried logging in from Server A to Server B but the system is still prompting me to enter password.

I tried using this: On server(A) you connect via ssh user1@host? You might try ssh -o PreferredAuthentications=publickey user1@host but it show permission denied Permission denied (gssapi-keyex,gssapi-with-mic,publickey,password,keyboard-interactive).

Any advise on how to check what is wrong? Just additional info in Server A i am not using the root account.

Best Answer

Try ssh -v this should provide additional information about the authentication process.

debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password,keyboard-interactive,hostbased
debug1: Offering RSA public key: /home/nce/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 277

Just to confirm your steps: You created a keypair via ssh-keygen Then you uploaded the key at .ssh/id_rsa.pub to the server(B) and appended it to the .ssh/authorized_keys for the user1.

On server(A) you connect via ssh user1@host? You might try ssh -o PreferredAuthentications=publickey user1@host

And you could provide a special/different identityfile by ssh -i ~/.ssh/serverB/id_rsa user1@host

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