ORA-12523 Connecting Via the Listener
(Doc ID 2313136.1)
Last updated on SEPTEMBER 04, 2020
Applies to:
Oracle Net Services - Version 12.1.0.2 to 12.2.0.1 [Release 12.1 to 12.2]Oracle Database - Standard Edition - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]
Microsoft Windows x64 (64-bit)
Symptoms
In an environment where multiple databases are registered against a single listener.
Some connections via the listener fail with the following error:
ORA-12523: TNS:listener could not find instance appropriate for the client
In this case, the LOCAL_LISTENER setting for each instance might be specified differently.
One instance shows the HOST field populated with a hostname.
Another instance shows the HOST field populated by an ip address.
Changes
This is likely a new installation or a database has recently been created on this server.
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |