ORA-28374: typed master key not found in wallet with Oracle 12c

A user reported the below error:

Select * from users;
ORA-28374: typed master key not found in wallet

gv$encryption_wallet indicated that the wallet was open and backed up on both nodes. It turned out that we had two copies of the wallet files in different locations. In order to resolve the issue, we
– stopped the RAC
– ensured that the wallet files matched and were in the correct location on both nodes
– updated the sqlnet.ora to indicate the wallet location on both nodes
And restarted the RAC. After this, the user was able to access the USERS table.

Author: Dean Capps

Database consultant at Amazon Web Services.