To hear knocking in your dreams suggests that your subconscious is trying to attract your attention to some aspect of yourself or to some waking situation. A new opportunity may be presented to you. Alternatively, the dream may be a pun that you are “knocking” on or insulting something or someone. Or perhaps there is a habit or behavior that you to stop or “knock it off”.
If you dream that you are knocking on a door, then it means that you are looking for direction and guidance.