cannot connect to Yahoo

Have two sites on Yahoo and cannot connect to either. Read their FTP changes to FTPS and SSL/TSL enables, but still cannot connect.

One site uses DW to connect, but I don't see any reference to TSL explict.

Other site uses WinSCP, but have followed Yahoo's directions on changes but still cannot make a connection.

Any suggetions?

What is DW?
Please post a link to their documentation that you have tried to follow. Also mention what options have you set explicitly. Session log file would be useful too.