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

Last updated on FEBRUARY 21, 2024

Applies to:

Oracle Net Services - Version 10.2.0.5 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

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In this Document
Purpose
Troubleshooting Steps
 Environment
 Information need to be collected
 Case 1: IP Conflict
 Case 2: OS/Network/Firewall Issue
 Case 3: Firewall Issue

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