Problem connecting with FTP Server

I'm new here... I just signed up to ask a question. All of a sudden I kept getting this file is missing error message on SmartFTP... and the FTP server info I had stored that had always worked, wouldn't sign in. It happened today as well... "Socket connected waiting for login sequence." is what it says, in the bottom status box and it just doesn't do anything from there. I updated to the new version, and im not getting the file is missing error message anymore, but it is still not connecting.

What could my problem be?
Thanks in advance.

Possible reasons:

- The FTP server you're trying to connect to could be down -> Try again in a few days.
- You've installed some software that blocks FTP connections, like a personal firewall or Windows XP SP2.
- You've installed some hardware (e.g. a router) that is not properly configured.

Etc.