In patching rinetd as part of ports, the default configuration file is changed from the "distributed" /etc/rinetd.conf to 
the "portsified" /usr/local/etc/rinetd.conf

Fix: A small patch (not sure I did it right):



NOTE: I originally had emailed the ports author since I felt this was a small and not pr-worthy-fix, but I ran into an issue 
whereby his mailer rejected my SPF because it didn't recognize the FreeBSD forwarder.--YEZxrKJM6fnH8oLDqz84lRXwfzkkEhxh0cOgTQy5G46QvxyB
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--- rinetd.8.orig	Mon Apr 14 21:19:44 2003
+++ rinetd.8	Mon Dec 10 16:14:08 2007
@@ -10,14 +10,14 @@
 .Nd internet
 .Dq redirection server
 .Sh SYNOPSIS
-.Nm /usr/sbin/rinetd
+.Nm /usr/local/sbin/rinetd
 .Sh VERSION
 Version 0.62, 04/14/2003.
 .Sh DESCRIPTION
 .Nm rinetd
 redirects TCP connections from one IP address and port to another. rinetd
 is a single-process server which handles any number of connections to
-the address/port pairs specified in the file /etc/rinetd.conf. 
+the address/port pairs specified in the file /usr/local/etc/rinetd.conf. 
 Since rinetd runs as a single process using nonblocking I/O, it is
 able to redirect a large number of connections without a severe
 impact on the machine. This makes it practical to run TCP services
@@ -26,9 +26,9 @@
 .Pp
 rinetd is typically launched at boot time, using the following syntax:
 .Pp
-/usr/sbin/rinetd
+/usr/local/sbin/rinetd
 .Pp
-The configuration file is found in the file /etc/rinetd.conf, unless
+The configuration file is found in the file /usr/local/etc/rinetd.conf, unless
 another file is specified using the -c command line option. 
 .Sh FORWARDING RULES
 Most entries in the configuration file are forwarding rules. The
How-To-Repeat: 
Install /usr/ports/net/rinetd, man rinetd VERSUS strings /usr/local/sbin/rinetd|grep rinetd.conf