Oracle : Ошибка ORA-12528

"TNS:listener: all appropriate instances are blocking new connections"
*Cause: All instances supporting the service requested by the client
reported that they were blocking the new connections. This condition may be
temporary, such as at instance startup.
*Action: Attempt the connection again. If error persists, then contact the
administrator to check the status of the instances.

Попробовать перевести

Поискать эту ошибку на форуме