nixos: don't white-list port 631 in the firewall when CUPS is enabled

If you want CUPS to receive UDP printer announcements from the rest of the
world, please add

  networking.firewall.allowedUDPPorts = [ 631 ];

to /etc/nixos/configuration.nix.

See <http://lists.science.uu.nl/pipermail/nix-dev/2013-November/011997.html>
for the discussion that lead to this.
nixos: don't white-list port 5900 in the firewall when x11vnc is enabled

If you want x11vnc to receive TCP connections from the rest of the world,
please add

    networking.firewall.allowedTCPPorts = [ 5900 ];

to /etc/nixos/configuration.nix.

See <http://lists.science.uu.nl/pipermail/nix-dev/2013-November/011997.html>
for the discussion that lead to this.
nixos: don't white-list port 8200 in the firewall when minidlna is enabled

If you want minidla to accept connections from the rest of the world, please
add

    networking.firewall.allowedTCPPorts = [ 8200 ];
    networking.firewall.allowedUDPPorts = [ 1900 ];

to /etc/nixos/configuration.nix.

See <http://lists.science.uu.nl/pipermail/nix-dev/2013-November/011997.html>
for the discussion that lead to this.