You may want to add these lines...

----- /etc/inetd.conf
#
# Borland International InterBase Database Server
#
gds_db	stream	tcp	nowait	root	/usr/local/interbase/bin/gds_inet_server  gds_inet_server
-----
----- /etc/services
gds_db		3050/tcp	# Borland International 
				# InterBase Database Remote Protocol
-----