Connection problem with att.net

I can't connect to upload.att.net. This is the text:

220 PWPFTPD 2.02 (6feb2002) Server (AT&T WorldNet (sm) Personal Web Pages FTP GIA server) [204.127.135.67]
AUTH SSL
500 Syntax error, command unrecognized: 'AUTH SSL'
Cannot login waiting to retry (30s)...

Any help is appreciated!