Oracle Error ORA-12528: TNS:listener: all appropriate instances are blocking new connections

Oracle Error Message

ORA-12528: TNS:listener: all appropriate instances are blocking new connections

Reason for the Error

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.

Solution

Attempt the connection again. If error persists, then contact the administrator to check the status of the instances.

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