I can not use FTP accounts

[petru]

Hi,

I created a reseller account and then, on that account, I have placed many users. A number of users created, have created one FTP account with user and password, but they can not use any FTP user account created, why?
For example, if one user try use FileManager with FTP user and FTP password created, ispCP Omega does not allow FTP access, why?

Please, can someone help me in the above issue.