Analyze TNS-12541 / ORA-12541: TNS:no listener using tcpdump (Doc ID 2996575.1)

Last updated on JANUARY 16, 2025

Applies to:

Oracle Net Services - Version 10.2.0.5 and later
Oracle Database Cloud Exadata Service
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
Information in this document applies to any platform.

Purpose

In this note, we will demonstrate how to analyze the root cause of the TNS-12541 / ORA-12541 error using tcpdump.

TNS-12541 / ORA-12541: TNS:no listener

Troubleshooting Steps

	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

Troubleshooting Steps

Information need to be collected

Case 1: IP Conflict

Case 2: OS/Network/Firewall Issue

Case 3: Firewall Issue

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