This was reported first by mharris on IRC. He's running WinXP SP3. I then tried to reproduce it on Win7 64bit with both Icecast 2.3.2 and Icecast 2.3.2-kh33. On the official build icecast2console.exe will fail to start when given an IPv6 bind-address (both :: and [::] and also explicit address in both forms). On the KH build it starts but doesn't bind to a port.

I didn't manage to get useful logs out on the official build. The KH build though complains in the form: EROR connection/connection_setup_sockets Could not create listener socket on port 8000 bind ::

PS: Unless there is an instant fix, this will miss the window for 2.3.3.