ORA-28157

Error: ORA-28157: Proxy user 'string' forbidden to set role 'string' for client 'string'

Causa: A proxy user was forbidden to use a role on behalf of a client through the command ALTER USER client GRANT CONNECT THROUGH proxy WITH ALL ROLES EXCEPT role.

Acción: Execute the command ALTER USER client GRANT CONNECT THROUGH PROXY proxy to grant the needed role.