Information
discard is a network service that simply discards all data it receives. This service is intended for debugging and testing purposes. It is recommended that this service be disabled. Disabling this service will reduce the remote attack surface of the system.
Solution
Comment out or remove any lines starting with discard from /etc/inetd.conf and /etc/inetd.d/*. Set disable = yes on all discard services in /etc/xinetd.conf and /etc/xinetd.d/*.