That's because your details entered are incorrect
the first box should be your domain or ip (i use mysite.com without the and )
the second box should be your cpanel login name
the third box should be your cpanel password
the forth box should not need changing (check with your webhost)
Adhy, are you 100% sure you're using the same FTP access details you used during the Oxwall installation?
But it works from my ftp clients FileZilla or Nautilus. I tried vsftpd and proftpd with many different settings.
It is 100% bug!
I have the same problem, talking to my hosting company they say its an Oxwall problem. My FTP details are correct and they tested it for me and I and they can FTP my site just fine.
Come on Oxwall there is a serious bug here you need to accet it and fix it.