Hi, I have been playing with libunbound (0.11). It works great :) I found that my hosts file (OS X 10.5.2) contains entries like fe80::1%lo0 localhost which ub_ctx_hosts doesn't like. You get (presumably from line 896 of libunbound.c) error reading hosts: syntax error. errno says: Invalid argument Also, It made me wonder if in general ub_ctx_hosts should just skip lines it can not read and continue trying to parse the rest of the hosts file. thanks John --- John Dickinson