Hi, I have not connected to my FTP in a while. Now that I did I got a warning that your SSL certificate expired on July 12th which is two weeks ago. Now you probably know this, but just in case...
We only support FTP over SSL. Look at this link to pull up some KB articles on how to setup FTP over SSL with your FTP client. http://support.Winhost.com/KB/c179/ftp-client-setup-ftp-over-ssl.aspx
Mmm... I am already using FTP over SSL with FileZilla and I have been using it for a long time. This is not an issue here. Did you read what I wrote? I am only saying that FileZilla never complained about your SSL certificate before and now it is because it *expired*. See screenshot