UNIX: ORA-12537 or ORA-12546 or ORA-12547 when connecting to the Database via the Listener

(Doc ID 1050756.6)

Last updated on MARCH 05, 2018

Applies to:

Oracle Net Services - Version to [Release 8.1.7 to 12.2]
Oracle Database - Enterprise Edition - Version to [Release 11.2]
Generic UNIX
Checked for relevance on 30-Apr-2010


Connection to the database server fails with ORA-12546 or ORA-12537

Local (BEQUEATH) connections work fine but a connection via the Listener fails with ORA-12537 or ORA-12547

[oracle@myhost]$ sqlplus myuser/mypass@mytns

SQL*Plus: Release - Production on Fri Apr 30 21:32:18 2010

Copyright (c) 1982, 2008, Oracle. All rights reserved.

ORA-12537: TNS:connection closed



 This is likely a new installation. 


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