Remote Connections Via the Listener to the Database Fail with TNS-12526, TNS-12527 or TNS-12528
(Doc ID 444120.1)
Last updated on FEBRUARY 22, 2019
Applies to:Oracle Net Services - Version 10.2.0.5 to 188.8.131.52 [Release 10.2 to 12.2]
Information in this document applies to any platform.
Connections via the listener to an instance that is in RESTRICTED status or in NO MOUNT status may fail with TNS-12526, TNS-12527 or TNS-12528 even when supplying the credentials for a privileged account. The lsnrctl services output will show that the service handler for this instance is in state: BLOCKED or RESTRICTED.
The full error text is:
From the above we can see that the listener status for that instance is
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