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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 31, 2022

Applies to:

Oracle Net Services - Version and later
Generic Linux
Generic UNIX


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

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ORA-12537: TNS:connection closed



 This is likely a new installation. 


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