Bug#805344: systemd: ListenStream=6566 in saned.socket only causes systemd to listen on [::]:6566

[Jens Georg]

> Did you check if it is actually not reachable over IPv4? IPv6 sockets
> can also accept IPv4 connections unless configured not to do so. This 
> is
> controlled system-wide via /proc/sys/net/ipv6/bindv6only which is "0" 
> on
> my computer (which is the default according to man:systemd.socket(5)).

And for some reason I don't know this is set to 1 here. Setting it to 0 
makes it work. Sorry about that.