The `openntpd` package is not installed anymore since commit bf8cc787ce46e9946ab47d5383feb1174da3f22a (20091006). The `ntpd` user is then non-existent on built amnesia systems.
This user is however mentioned in `/etc/firewall.conf`.`iptables-restore` being apparently picky about imperfect configuration files, it refuses to load it, and the firewall-level Tor enforcement is therefore not effective.