Error "ORA-12638: Credential retrieval failed" appears when trying to connect to Oracle db using Spotfire Connector for Oracle

Error "ORA-12638: Credential retrieval failed" appears when trying to connect to Oracle db using Spotfire Connector for Oracle

When trying to connect to an Oracle database using data source/connector, and you intend to use user name and password authentication, you receive the error "Could not connect due to an unknown error. External error: ORA-12638: Credential retrieval failed". There are 2 possible suggested solutions to this error:

1. Go to the sqlnet.ora file in the $ORACLE_HOME/network/admin directory. Change the following parameter:

Change - SQLNET.AUTHENTICATION_SERVICES= (NTS)
To: - SQLNET.AUTHENTICATION_SERVICES= (NONE)

FYI: When set to NTS, Oracle tries to authenticate you using your Windows credentials.

2. In Windows, bounce the server (stop and re-start) the Windows services for Oracle. http://www.dba-oracle.com/t_ora_12638_credential_retrieval_failed.htm