dhcpd: Forward map FAILED: REFUSED

If you see this:

Dec 28 12:48:07 toiler dhcpd: Forward map from dent.unixathome.org to 10.55.0.60 FAILED: REFUSED

Perhaps you forgot to unfreeze a domain. In my case:

rndc unfreeze 1.8.10.in-addr.arpa.

For more info, see this blog post on dynamic dns.