To block FTP access for specific user follow the steps:



           *   Goto,

                
root@host [/]# vi /etc/ftpusers


              and enter the username which you want to block the FTP access.



When a user attempts to log into your system using ftp, the ftpd daemon checks the /etc/ftpusers file. 

If the file exists, and the user's login name is listed in it, ftpd denies access to the user.



User accounts that specify a restricted login shell in /etc/passwd should be listed in /etc/ftpusers, 

because ftpd accesses local accounts without using their login shells. UUCP accounts should also be listed in /etc/ftpusers.



Each line in /etc/ftpusers consists of a login name with no white space. Following is an example /etc/ftpusers file:



    *  uucp

    *  guest

    *  nobody