ORA-28029: could not authorize remote server

admin

ORA-28029: could not authorize remote server for user string
Cause: During the course ofopening a privileged database link, the remote server
was found to lack the necessary authorizations to connect as the current global
user. This may be because the server was not authorized by the network security
service. Or it may be because the local server is restricting access by theremote
server using the DBMS_SECURITY_DOMAINS_ADMIN package.
Action: Grant the remoteserver the proper authorization to connect as the given
global user, and check that the local server is not restricting access.