FMw "ONS configuration failed" or "oracle.ons.NoServersAvailable: Subscription time out"

(Doc ID 2308193.1)

Last updated on FEBRUARY 08, 2018

Applies to:

JDBC - Version and later
Information in this document applies to any platform.


After upgrading Fusion Middleware (FMW) from to, JDBC fails with the error "ONS configuration failed" or "Subscription time out".

Exception stack

- Exact same configuration works fine in SQL Developer (
- This issue is consistent.
- Issue is seen for all datasources.
- Issue is seen while creating a new datasource as well as while testing an existing datasource.
- This is a single instance database, not RAC, so no ONS service running.


FMW was upgraded from to


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