ftp client not connecting

I had been collecting shows from a website, the archives.org for a few days, then recently got the following error message in the log.

[18:16:49] SmartFTP v2.0.996.33
[18:16:50] Resolving host name "ia301103.us.archives.org"
[18:16:52] Connecting to Port: 21
[18:16:53] No connection could be made because the target machine actively refused it.
[18:16:53] Client closed the connection.
[18:16:53] Active Help: https://www.smartftp.com/support/kb/58
[18:16:53] Cannot login waiting to retry (120s)...

I am unable to gain access to this site now, does anyone know why, it was working great for a few days.
thanks for your help

The FTP server you are trying to access is down. Contact the administrator of this server.