The door in the dream means that the future of the unknown.Dream knocking at the door of the voice, is the good fortune.

If dreaming that I am knocking at the door, that is to remind yourself (Duke of zhou interprets/), must be careful when make friends, to prevent and cultivate people who are irresponsible, or predictor will have better luck in the near future.If dreaming that he heard a knock at the door, or see someone knocking at the door, it means that your may many fortunes find their way in the near future.If the dream of heard a knock at the door, then your information will receive a distant friends, and will gain the friendship of a friend.