Oracle Solution for Error ora-12660

ORA-12660: Encryption or crypto-checksumming parameters incompatible

What triggered the Error:

One side of the connection specified "REQUIRED" for encryption or crypto-checksumming, while the other side specified "REJECTED".

What should we do to fix it:

Change the "REQUIRED" side to "REQUESTED" if the you want encryption or crypto-checksumming to be optional, or change the "REJECTED" side to "ACCEPTED" if you do not want the service to be optional.