I'm using Linode, and I've asked around on the IRC channels, but no one seems to know. I've logged into my server via LISH (reference), and I used the correct password, and everything went fine. However, I need to login via SSH/FTP, and I can't. It keeps on giving me "permission denied". I know the password is correct because I reset it via LISH, and I know I've got the login method right because I've logged into my server before using the exact same commands. I sure hope this doesn't turn out to be some noob issue, or I'm going to be quite frustrated.
You need to run ssh (the client, and possibly the server) with more verbosity to understand why authentication is failing. For the client, run
On the server end, look in the logs. /var/log/auth.log will give you a pretty good idea about what happens when you try to login, look for messages that contain "sshd". There are a variety of reasons why authentication could be failing, ranging from simple (you aren't using the right username) to more complicated (sshd is configured to use the wrong authentication system).