Disconnected no supported authentication methods available

Question

Yes, I'm aware questions like this already exist, and I've already checked quite a few out, but the methods were unable to help me. I am running CentOS 6 on my VPS. This error occurs when I try to log into the username while connecting with PuTTY.

I am trying to log into a user. The path is /home/[name]. Here are my sshd_config settings (it's not on default port):

PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_key
PasswordAuthentication no
ChallengeResponseAuthentication no

The authorized_key contains the public key. I am relatively new to Linux, so any tips would be appreciated.

EDIT: I've tried adding the private key to PuTTY, and now it just says "Server refused our key", and the same error message pops up.

Solution

Linux is very sensitive to permissions settings.

From your home directory, you should have the following:

user@server:~$ ls -alF .ssh/
drwxr-xr-x 2 user user 4096 Oct 30 04:39 ./
drwxr-x--- 5 user user 4096 Nov  5 15:50 ../
-rw------- 1 user user 1457 Oct 30 00:55 authorized_keys