ssh: cannot use pubkeyfile to connect to server without password

user1538798

2/24/24, 8:48 AM

This is my situation. I have setup the admin pc to be able to remote access a cluster of pc via ssh without password using keyfile, using the following steps

Generate the key, call it access

ssh-keygen

I have gotten 2 files from there access(private key) and access.pub (public key)

Then I copy the key to my cluster

ssh-copy-id -i ~/.ssh/access.pub xxx@address

Then I try to login with the usual ssh login

ssh xxx@address

Steps 2 and 3 is repeated for all PCs in cluster and I can access all the pc without password by ssh

Unfortunately one of the pc has to be reformatted and I try to use the same steps again but I could not access the system again. I wonder what is wrong

I have tried to use ssh -vvv to find out what is wrong. The ssh debug message always seem to always give message type 51(which I think is wrong authentication or something along the line).

The authentication process seem to proceed to search for the key eg id_dsa, id_ed2259 etc (I guess in my client pc). This is what I feel like some last ditch attempt to authenticate by key

I wonder what is wrong with my authentication (the first time round). It did proceed to send the public key, I can view the number in the debug printout RSA sha256:xx...............xx agent

The key also appears on the target authorized_key and the sshd_config is being set to PubkeyAuthentication yes 'AuthorizedKeysFile ~/.ssh/authorized_keys ....'

I wonder what is wrong? What area have I left out. Could someone provide a direction on where I could look at or possibly missed out?

Thanks

0 + 1

ssh

password

muru

2/24/24, 9:20 AM

What do the server's ssh logs say?

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: ssh: cannot use pubkeyfile to connect to server without password

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