ORA-28150 proxy users do not have permission to access resolved

ORA-28150 proxy users do not have access to resolution ORA-28150: proxy not authorized to connect as client Cause: A proxy user attempted to connect as a client, but the proxy was not authorized to act on behalf of the client. action: Grant the proxy user permission to perform actions on behalf of the client by using the alter user... grant connect command. the solution is to add permissions to the users to access:

Alter user PIANO_COMP_TEST grant connect through database_name -- USER name to be accessed;