Oracle : Ошибка ORA-12527

"TNS:listener: all instances are in restricted mode or blocking new connections"
*Cause: All appropriate database instances supporting the service requested
by the client reported that they either were in restricted mode or were
blocking the new connections. The Listener does not allow connections to
such instances. This condition may be temporary, such as at instance
*Action: Attempt the connection again. If error persists, then contact the
database administrator to check the status of the instances.

Попробовать перевести

Поискать эту ошибку на форуме