Prosody 0.9+ supports IPv6 for all services, but at the moment some manual steps may be required to set it up.
The first version of LuaSocket with IPv6 support is 3.0rc1:
Our package repository contains 3.0rc1, simply install the
The Prosody 0.9 Windows packages include an IPv6-capable luasocket.
Some older versions of Windows, notably XP and 2003, don't have IPv6 enabled by default, see Microsofts support page about how to install and uninstall IPv6.