When a user attempts to login using ftp, the following may be seen in the system logs:
ftpd: [ID 831785 daemon.warning] setsockopt (IP_TOS): Option not supported by protocol
This is due to the FTP daemon not supporting IPv6.
It is likely that inetd has been configured to use IPv6 for the ftpd service.
Specify only IPv4 in INETD :
1. Modify the ftpd line in /etc/inetd.conf
2. Change the word "tcp6" to "tcp"
3. Restart INETD