DROBO5N Apache permission deny



I just install Perl, mysql, apache. It shows “It works” on port 8080. But when I ftp a file onto apache/www it says “permission deny”. I’m able to copy a file with Finder into the www directory but not with a ftp client. I can connect and see files and folders (created or copied with Finder) under www dir but not create, copy, delete or so on with ftp client.
Any idea to gain full access ?