Sqlplus Connection Fails with ORA-12638
(Doc ID 782419.1)
Last updated on FEBRUARY 01, 2022
Applies to:Advanced Networking Option - Version 10.2.0.1 and later
z*OBSOLETE: Microsoft Windows
You are using Operating System authentication like NTS or Kerberos. While connecting to the database from sqlplus it fails with the ORA-12638.
You may connect with the following syntax
For local SYS connections,
sqlplus / as sysdba
For User connections,
sqlnet client trace shows the below SSPI error:
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