Allow real user into FTP account

[Monotoko]

Hi Guys,

I use my server for multiple things and would like to back my iPhone up via FTP onto the server. In order to that the application is asking for some FTP details.

I went ahead and created my user via SSH using useradd and passwd, but was surprised to meet this when I tried to login through Filezilla:

Command: USER ibackup
Response: 331 Password required for ibackup
Command: PASS *****
Response: 530 Login incorrect.

Checked the username and the password, could it possibly be because I am trying to login as a real user of the system, as oppose to a virtual one ispcp created? (proftpd is managed by ispcp still) I have Googled for hours trying to find an answer but there seems to be nothing on letting a real user into the FTP system

Daniel