My Oracle Support Banner

TNS-12557, TNS-00527 when starting the TNS Listener on Microsoft Windows (Doc ID 2205720.1)

Last updated on JANUARY 18, 2025

Applies to:

Oracle Net Services - Version 11.2.0.1 and later
Oracle Cloud Infrastructure - Exadata Cloud Service - Version N/A and later
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 Database - Enterprise Edition - Version 19.18.0.0.0 and later
Microsoft Windows x64 (64-bit)

Symptoms

Attempts to start an existing 11.2.0.1 Listener on Windows 2008 R2 results in:

 
Also, you have made sure that the ORACLE_HOME environment variable is not set (refs below)

Cause

To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document
Symptoms
Cause
Solution
References


My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.