According to the man: -b address/port Note the delimiter between host and port is a slash (/), not a colon, to be able to correctly handle IPv6 addresses. However, conf.d/rbldnsd states: # A whitespace-separated list of addresses on which to listen. The # syntax is "host:port", where the port defaults to 53. Please change it to host/port instead of host:port.
Fixed, and I'll file the stablereq for the new version right away. *rbldnsd-0.997a-r2 (29 Jun 2015) 29 Jun 2015; Michael Orlitzky <mjo@gentoo.org> +rbldnsd-0.997a-r2.ebuild, files/confd-0.997a: Fix comment in conf file and revbump to push it out, bug #553296.
Thanks