Are you sure that you used the correct (full) ftp username? A ftp username consists of a prefix and the part that you entered as user, so when you login with a ftp client the full username incl. prefix has to be used.
You can see the full username e.g. in the list of ftp users in ispconfig in the username column.
Last edited by till; 2nd May 2013 at 12:10.
Reason: typos :)