The SQLNET.ora file is a configuration file available in
ORACLE_HOME\NETWORK\ADMIN location. The parameter
"SQLNET.AUTHENTICATION_SERVICES" available in the SQLNET.ora file is
used to specify the authentication services.
If you are facing error ORA-12638 it may be due to the wrong
authentication service mentioned in the parameter. Change the parameter value
from "nts" to "none" and try.
sqlnet.authentication_services= (nts)
Change the above to
sqlnet.authentication_services= (none)
Here the "nts" specifies the windows native
authentication, which is used in the windows. with this parameter and ORA_DBA
role a windows user can login into the database without database username and
password.
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