cant get smartfpt to recognize a new site

Hi all,
I have used smart ftp for over a year and find it very easy to use,
but recently I bought a new hosting package and for some reason smartftp can not resolve the host name,
I have tried with another ftp and it works no problem, except I hate using the other ftp

I have checked I am using port 21

Can anyone tell me what I am doing wrong please

Graham taylor