Linux Key authentication Error resolution

Problem Description:

Xshell Login with key authentication to indicate that the selected user key is not registered on the remote host

Problem solving:

View Log /var/log/secure, which is basically a permissions issue for the user root directory

According to the log prompt:

 for Directory/root

Indicates a problem with root permissions:

chmod g-w/home/your_user
chmod 700/home/your_user/.ssh
chmod 600/home/your_user/.ssh/authorized_keys

Reference:

https://www.daveperrett.com/articles/2010/09/14/ssh-authentication-refused/

Linux Key authentication Error resolution