I'd consider this a bug in the clients (all of them) rather than freeciv-server. As Marko says, if you're running freeciv-server standalone, you're as likely as not to want other hosts to connect to it, and if not, you can always specify the "--bind localhost" argument.
I'm looking to make the clients use "--bind localhost" for client-spawned servers (i.e., single-player games) by default for 2.4.x, which I think will satisfy the intent of this bug. A trivial patch is in the upstream bug tracker. Feel free to backport to earlier versions for Debian if you wish; I'm avoiding doing so upstream primarily due to the risk of it exposing some platform-dependent networking horror that completely breaks single-player games. (I don't think #572990 is relevant here, except tangentially as an example of the sort of platform-dependence I'm scared of.) -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org