conection refused

Hi im running winscp 5.1.3 and everytime i try to login it says 'connection refused.' I would like to know what is wrong because i have downloaded every Winscp program on this site and all have the same results. Is there any thing to do.
At the moment out of 5 stars i would have...
(*/5) one star :(

Please read documentation:
https://winscp.net/eng/docs/message_connection_refused

If that does not help, come back.