Collisions Detection Functions Not Called, Walking Through Walls

Sorry for asking such a common question, but I've gone through so many answers / tutorials, but they all seem slightly different or I'm not understanding how apply those solutions to my problem.

The GameObjects:
1. A wall with box collider that is enabled and is not a trigger. The wall has no rigidbody.
2. An animated character with many rigidbody and collider components so that animation can be turned off and he can ragdoll.

What works:
The animations look great, the conversion to ragdoll looks great, the character's feet stay solid on the floor. Many hours of experimenting and reading to figure all that out.

What doesn't work:
Collisions are not detected with the wall (or other characters). The character walks right through and the character's functions for OnCollisionEnter (or OnTriggerEnter) do not get called.

What I've tried:
I've tried setting the 4 variables below in different combinations it to get collisions working. None seem to help.

What am I not understanding?

 protected void EnableCollisionDetection()
 {
     foreach (Rigidbody rb in gameObject.GetComponentsInChildren<Rigidbody>())
     {
         rb.isKinematic = false;
         rb.detectCollisions = true;
     }
     foreach (Collider c in gameObject.GetComponentsInChildren<Collider>())
     {
         c.enabled = true;
         c.isTrigger = true;
     }
 }