ORA-12154 or TNS-3505 Using EZCONNECT or Hostname Naming Adapter
(Doc ID 1925336.1)
Last updated on JANUARY 20, 2025
Applies to:
Oracle Net Services - Version 10.2.0.1 to 11.2.0.4 [Release 10.2 to 11.2]Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Gen 2 Exadata Cloud at Customer - Version N/A and later
Oracle Cloud Infrastructure - Exadata Cloud Service - Version N/A and later
Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Information in this document applies to any platform.
This document describes an issue where the EZCONNECT or HOSTNAME naming adapter fails with ORA-12154 or TNS-3505. A client using the TNSNAMES adapter with the
same address information is likely to be successful if the issue documented here is the problem.
Goal
When using the EZCONNECT or HOSTNAME naming adapter the following errors are thrown:
TNS-12514 TNS: could not resolve the connect identifier specified
TNS-03505: TNS: Failed to resolve name
Example using the following might fail with an ORA-12154:
SQL*Plus my_user@\"1HOSTNAME:1521/ORCL\"
Enter password:
ERROR: ORA-12154: TNS:could not resolve the connect identifier specified
Using the same information in a tnsnames.ora file will allow a successful connection:
Solution
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In this Document
| Goal |
| Solution |
| References |