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 220.127.116.11 [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:
TNS:listener: all appropriate instances are in restricted mode
TNS:listener: all appropriate instances are blocking new connections
TNS:listener: all instances are in restricted mode or blocking
The only significant change would be that the instance has been started up in some kind of "restricted access" mode such as RESTRICTED or NO MOUNT.
Here is an example of starting up the database in restricted mode and the output for lsnrctl status:
1.Start the database with restricted mode
2.Check the status of the listener
Connecting to (ADDRESS=(PROTOCOL=tcp)(HOST=<hostname>)(PORT=1521))
STATUS of the LISTENER
Version TNSLSNR for 32-bit Windows: Version 10.1.0.2.0
Start Date 21-JUL-2003 18:19:03
Uptime 2 days 17 hr. 36 min. 17 sec
Trace Level OFF
Listener Parameter File e:\10g\network\admin\listener.ora
Listener Log File e:\10g\network\log\listener.log
Listening Endpoints Summary...
Service "<service.domain>" has 1 instance(s).
Instance "<instance>", status RESTRICTED, has 1 handler(s) for this service...
The command completed successfully
From the above we can see that the listener status for that instance is
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