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RAC - Connections Intermittently Fail With: ORA-12502: no CONNECT_DATA from client (Doc ID 2550216.1)

Last updated on JULY 02, 2019

Applies to:

Oracle Net Services - Version 11.2.0.4 and later
Information in this document applies to any platform.

Symptoms

Remote connections using SQL*Plus are intermittently failing with the following error:
ORA-12502: TNS:listener received no CONNECT_DATA from client


For example:

 

SQLPLUS username@<TNS _ALIAS>
Password:

SQL*Plus: Release 11.2.0.1.0 Production on Thu May 16 14:59:48 2019

Copyright (c) 1982, 2009, Oracle. All rights reserved.

Enter password:
ERROR:  ORA-12502: no CONNECT_DATA from client


Changes

 This is either a new implementation of RAC or some configuration changes have taken place.

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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