When bad doors are open, either front or back, the enemy comes in to kill, steal, and destroy. He does this very fast too.  Here are some of the manifestations:

1.    Evil strangers come in (Psalm 18:45).

David and Joseph were demoted until God repositioned them to the places of honor of king and prime minister respectively that He had ordained for them. 1 Samuel 16:19, 2 Samuel 5:3-5, Genesis 39:1, 41:40-45.

2.    Serpents and scorpions come in (Luke 10:19).

These are satanic agents moving around as me and women. They sting and bite if you let them in.

3.    Old problems come back.

Rachel was a chip of the old block.  She was just like her father, deceptive, trickish, and manipulative.  Her lies and deception led to her untimely death.

4.    There is failure where there should be success. (Joshua 7:1-12).

Achan opened the door for the enemy to come in and trash Israel in battle by taken the accursed thing that God had expressly forbidden them to touch.

5.    Hindrances and embargoes.

Limitations and barriers to success start manifesting.

6.    God appears very far away.

This is what happened to Adam and Eve after they opened the door for the serpent to come in and bite them. They lost their vibrant fellowship with God and hid when they heard Him coming.

7.    Affliction and Hardship

Poverty, sickness, dryness, and joblessness become the order of the day.

8.    The enemy comes in and puts the vehicle of destiny on reverse

You start retrogressing instead of going forward in life.

9.    Good things are stolen.

These include marriage, health, property, favor, virtues, fruitfulness, and breakthroughs.

10. Frustrations and discouragement

11. Failure instead of success

12. Hardship and affliction

13. Satanic delay of blessings and sluggish progress.