Oracle Database Error Code ORA-12527 Description :
TNS:listener: all instances are in restricted mode or blocking new connections
Error 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 startup.
How to Solve :
Attempt the connection again. If error persists, then contact the database administrator to check the status of the instances.
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