Dan Durrer of No-IP.com informed me of the new noip version so I upgraded the port.
Fix: I did the testing specified by the Porter's Handbook and also showed my changes to Dan Larsson, who upgraded from version 1.6 to 2.0.12 while I was off on vacation. Here's a list of the changes to the port:
1) PORTVERSION updated from 2.0.12 to 2.1.0
2) PREFIX/share/doc/PORTNAME changed to DOCSDIR in Makefile and
pkg-plist, to conform better
3) patch-noip2.c functionally identical, but regenerated so that the
line numbers and context are more accurate.
4) two occurances of "no-ip.conf" in pkg-deinstall changed to