Amazon EC2 SSH server sent: ( publickey, gssapi-keyex,gssapi-with-mic)

Question

I get this error message when trying to connect with ssh.

Disconnected: No supported authentication methods available (server sent: publickey,gssapi-keyex,gssapi-with-mic)

I create a instances(cent os), generated my webserver.pem, puttygen imported that and output a ppk

I have seen that it may be a permissions issue with the ~/.ssh on the server but how can i change the permissions on the server without ssh access to the server? Is there another way to connect that i am not aware of? I am quite new to the amazon ec2 stuff.

I am on a windows system right now using putty.

Solution 1

My security groups were incorrect. I remade the instance with the correct security groups

Solution 2

The below steps worked for me.

1. Edit sshd_config file sudo vi /etc/ssh/sshd_config.
2. Search for PasswordAuthentication
3. If it is no, change it to yes. For me it was commented. If so, uncomment it.
4. Restart sshd service sudo systemctl restart sshd.service

Done.