My Oracle Support Banner

Get ORA-12638 Error when Connecting via SQL*Plus Using NTS authentication (Doc ID 273665.1)

Last updated on MARCH 03, 2024

Applies to:

Oracle Database - Enterprise Edition - Version 9.2.0.4 and later
Information in this document applies to any platform.

Symptoms

ORA-12638 when connecting via SQL*PLUS using TNSNAMES resolution with SQLNET.AUTHENTICATION_SERVICES=(NTS) set in the SQLNET.ORA file.

Cause

To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

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