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How can I ssh access on my second computer (ubuntu)? Permission denied (publickey)

Posted July 9, 2020 1.3k views
DigitalOceanUbuntu 20.04

I have a ssh access via terminal on my mac working fine. Lately I got another computer (Ubuntu 20 Linux). I am trying to set up ssh access, but it just does not let me in, saying “Permission denied (publickey)”.

I added my ssh pub key (id_rsa.pub) on my local computer(Ubuntu) to the Digital Ocean (settings -> security). But, it does not fix the issue.

I also pasted the pub key in ~/.ssh/authorized_keys in the droplet.

What do I need to do to ssh access on my local ubuntu machine?

FYI: I can set password login by changing PasswordAuthentication yes in /etc/ssh/sshd_config in the droplet. However, this is not ssh access without password.

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nfujioka
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nfujioka

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2 answers
bobbyiliev July 9, 2020

Hi there @nfujioka,

You would need to first create a new SSH key pair on your Ubuntu computer. You can follow the steps on how to do that here:

https://www.digitalocean.com/community/tutorials/how-to-set-up-ssh-keys–2

Once you have your keys ready, copy your public key and add it to your Droplet in the ~/.ssh/authorized_keys.

That way you will be able to SSH with your new key pair from your Ubuntu computer to your Droplet.

Hope that this helps!
Regards,
Bobby

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  • nfujioka July 9, 2020

    Hi, I have already done that with my existing ssh keys. But, it does not work. Do you mean I cannot use my existing key? I use it with github and works fine with github but not with digital ocean droplet.

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    • bobbyiliev July 10, 2020

      Hi there @nfujioka,

      In order to be able to use your existing key, you need to add your private key to your Ubuntu server. So basically copy the ~/.ssh/id_rsa file from your Mac to your Ubuntu Laptop.

      And one more thing to add here is that your ~/.ssh needs to be set to 700 permissions:

      • chmod 700 ~/.ssh

      And your private key needs to have 600 permissions for security reasons, otherwise, it would not work:

      • chmod 600 ~/.ssh/id_rsa

      If this still does not work, you could run the ssh command with the -vvv argument to see some verbose information and the possible root cause of the problem:

      ssh -vvv root@your_ip_address

      Hope that this helps!
      Regards,
      Bobby

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jvalcher February 21, 2021

On the REMOTE server:
$ sudo vim /etc/ssh/sshd_config
PubkeyAuthentication yes
PasswordAuthentication yes
$ sudo systemctl restart sshd

On LOCAL server:
$ ssh-copy-id user@remoteserverip

On REMOTE server:
$ sudo vim /etc/ssh/sshd_config
PasswordAuthentication no
$ sudo systemctl restart sshd

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