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Connections Via a 9i Listener to a 10g Instance Fail With ORA-12500 (Doc ID 271179.1)

Last updated on FEBRUARY 19, 2019

Applies to:

Oracle Net Services - Version 9.0.1.0 to 10.2.0.5 [Release 9.0.1 to 10.2]
Information in this document applies to any platform.

Symptoms

1) You have a 10gRx version of the database

2) On the same server, you have 9.2.x listener running.

3) Remote client connections via the listener fail with ORA-12500 errors. 


4) The listener.log shows:

TNS-12500: TNS:listener failed to start a dedicated server process

Changes

It is likely this is a new installation of 10g in an environment where only 9i existed previously.

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References

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