Hi @gusans. Thanks for being part of GoDaddy Community! I'm not sure why you'd be seeing that error. My guess would either be that there is an issue with your account or the SSH client you're trying to use requires you to generate a key to connect. I wasn't able to duplicate this error when connecting with Putty to a test account. I'd recommend giving Putty a try if you haven't already. Otherwise, you may want to connect with our support team.
JesseW - GoDaddy | Community Manager | 24/7 support available at x.co/247support | Remember to choose a solution and give kudos.