ORA-12638: Credential Retrieval Failed

Applies to:

Information in this document applies to any platform.

Problem:

"ORA-12638: Credential Retrieval Failed" message when log in to the database. User is unable to log in to the database.

Reason:

in "sqlnet.ora"  there is an entry "QLNET.AUTHENTICATION_SERVICES= (NTS)"
This is used to support for authenticating using Windows credentials

Solution:

Replacing the line:

SQLNET.AUTHENTICATION_SERVICES= (NTS)

with

SQLNET.AUTHENTICATION_SERVICES= (NONE)

in sqlnet.ora. Find your sqlnet.ora in $ORACLE_HOME/network/admin folder.

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