I'm on garth, and SSH works fine for me. Which machine are you on? What's the symptom? Does plain FTP work?
A long while back, I'd connect, or something like that, and then get a "Server closed connection" because my IP address was being blocked due to too many failed login attempts by me. This is an SSH/SFTP-only issue, as FTP still worked for me.
I'd suggest you contact support, and give them your home IP address so they can troubleshoot.