Windows: Connections Fail with ORA-12640 or ORA-21561
(Doc ID 744125.1)
Last updated on DECEMBER 17, 2020
Applies to:Oracle Net Services - Version 10.2.0.1 and later
Oracle Database - Enterprise Edition - Version 18.104.22.168 and later
Connections to database fail, reporting the error code ORA-12640 Authentication adapter initialization failed.
SQLNET.AUTHENTICATION_SERVICES is set to NTS in the SQLNET.ORA file.
Changing SQLNET.AUTHENTICATION_SERVICES=NONE and connections then fail with the error code ORA-21561 OID generation failed.
Seen for connections using third party applications and oracle tools such as recovery manager (RMAN).
A typical Oracle Net level 16 client trace of RMAN failure shows following:
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