Putty error: No supported authentication methods available (server sent: publickey)

June 17, 2017 48.3k views
Nginx LEMP Ubuntu 16.04 Ubuntu

I am trying to setup a server for my wordpress site. I was going through this tutorial (https://www.digitalocean.com/community/tutorials/initial-server-setup-with-ubuntu-16-04) to setup ssh keys.
After step five when it says to try logging in with the ssh keys with the newly created user putty returns back with a error saying: "No supported authentication methods available (server sent: publickey)"
I put the public key in the authorized_keys file and everything the tutorial said but it still returns that error. If I try logging in to root with the same private key it works fine. It just shows that error when I try logging in with the new user.

Any help would be appreciated.

  • I would also like to mention, I made the keys with Puttygen and I added the public key to digitalocean. I used the key when creating the droplet.

  • I guess you have loaded the .pem file first and then generated the Public key and private key by randomness.

    But if you generate key-pair by randomness and them upload .pem file to generate Public and private key pair then you won't get this error.

4 Answers


The public key generated by puttygen cannot be used directly on Ubuntu you need to change its format as mentioned here

Hope this helps

@thelunchbawx, I am having the exact same problem. Did you figure out a solution?

I also had this problem, login from putty as root was fine but from the non-root user gave me the error above. I tried the methods given in the link but it didn't help, eventually I managed to do it by following this guide: https://www.vultr.com/docs/using-your-ssh-key-to-login-to-non-root-users

In my case, I removed default login name from putty and it worked

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