Overcoming the Oracle Apps R12 Error APP-FND-01542 on 64 bit Redhat 5.5

Symptom:

Ever try to login to Oracle Apps R12, and get the error APP-FND-01542 on 64 bit Redhat 5.5?

APP-FND-01542
The applications servers is not authorized to access this database.

Here is how to solve it.