They are not working properly, stuff broke because of this when I updated.
Plugins: WorldGuard, CraftBookCommon, Lockette, FullChest, WorldEdit, CraftBookCircuits, DropChest, Permissions,...
they figured out a way to crash xAuth.
I wonder if they were stupid enough to use their minecraft account password with xAuth
I did not.
full server log while they were on:
Separate names with a comma.