hosts.deny (/etc/hosts.deny)

The /etc/hosts.deny file is a configuration file for the /usr/sbin/tcpd program. The hosts.deny file contains entries for the rules defining which hosts will NOT be allowed access to a service on your machine.

The default in LEAF is:

# /etc/hosts.deny: list of hosts that are _not_ allowed to access the system.
#                  See hosts_access(5) and /usr/doc/net/portmapper.txt
#
# Example:    ALL: some.host.name, .some.domain
#             ALL EXCEPT in.fingerd: other.host.name, .other.domain
#
# The PARANOID wildcard matches any host whose name does not match its
# address.
ALL: PARANOID
# Prevent all access not explicitly allowed in hosts.allow
ALL: ALL