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SCAN Registration Issue: Services Fail to Register to SCAN Listeners (Doc ID 1448717.1)

Last updated on JUNE 16, 2022

Applies to:

Oracle Net Services - Version to [Release 11.2 to 12.2]
Information in this document applies to any platform.
This issue might occur in an environment where RAC / SCAN was configured and where the Applications or E-Business Suite utility AutoConfig was used to configure the database environment. This issue might also occur when a customer attempts to use a TNS connect string (versus the EZCONNECT setting) for REMOTE_LISTENER where the single SCAN address is specified. See below.


Services are failing to register in new installation of RAC with SCAN configuration.

Lsnrctl services LISTENER_SCAN<n> shows no services registered.

The REMOTE_LISTENER setting might be set in either of the following 2 ways:

1)  REMOTE_LISTENER is set to EZCONNECT style string:

For our example:


Where SCANHOST is the SCAN address that resolves to unique ip addresses.


2)  REMOTE_LISTENER is set to a tnsnames entry created by the user where only the SCAN hostname is listed in a single address:



SCANHOST resolves to 2 or 3 unique ip addresses.


This is likely a new installation of RAC with SCAN or this is an EBusiness Suite environment and the AutoConfig utility has recently been run in this environment.   In an E-Business or Applications environment, the AutoConfig utility might be run to configure the database environment.  This could also be a SCAN configuration and the DBA has chosen to set REMOTE_LISTENER to a tnsnames entry versus the recommended EZCONNECT style string.


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