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12c: ORA-1017 or other connection problems using the DEFAULT_SERVICE_LISTENER parameter in 12c Multi-tenant environment (Doc ID 2279545.1)

Last updated on JULY 06, 2021

Applies to:

Oracle Net Services - Version to [Release 12.1 to 12.2]
Information in this document applies to any platform.


The following pertains to the EZCONNECT or Easy Connect (or HOSTNAME) method of connecting to a 12.1 and higher Database.

1. When using EZCONNECT and specifying the SERVICE_NAME in the string, the connection is successful:
sqlplus username/password@//hostname:port/service_name

2. When using EZCONNECT and NOT specifying the SERVICE_NAME value, the connection fails:
sqlplus username/password@//hostname:port
ORA-12504: TNS:listener was not given the SERVICE_NAME in CONNECT_DATA
* This is expected as there needs to be a DEFAULT_SERVICE_<listener_name> = x value included in the listener.ora file to reflect a DEFAULT Service.
ORA-12504 When Using (HOSTNAME) Method For 11G Client/Database (Doc ID 556996.1)
Database Net Services Reference

3. When setting the parameter "DEFAULT_SERVICE_LISTENER=*service_name*" in the listener.ora as per Oracle docs, and then connect as in #2 above, this results in an error:
sqlplus username/password@//hostname:port
ORA-01017: invalid username/password; logon denied

* This is happening despite the username and password being the same as all of the above attempts.


 You may have recently upgraded to 12c and using Multi tenant PDBs.


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