Hi @pego. Welcome to GoDaddy Community! There are a few things that could cause this. When you enter your FTP information, I would suggest using the IP address for the hosting account instead of a domain or subdomain. That will bypass any issues that might be occurring with your domain's DNS. If that doesn't help, you could provide the FTP log here. That may provide enough information for others to offer further suggestions.
JesseW - GoDaddy | Community Manager | 24/7 support available at x.co/247support | Remember to choose a solution and give kudos.