SQLNET AUTHENTICATION_SERVICES in Windows environment

Environment:
Windows Server 2003 R2, Oracle 11.2.0.4


windows service OracleServiceSID is up
windows account is added in local group ORA_DBA
Oracle password file is created

SQLNET.AUTHENTICATION_SERVICES in sqlnet.ora on server	none	nts	all
/ as sysdba	ORA-01017: invalid username/password; logon denied	ok	ORA-12641: Authentication service failed to initialize
local: sqlplus sys as sysdba	ok	ok	ORA-12641: Authentication service failed to initialize
local: sqlplus sys@tnsname as sysdba	ok	ok	ORA-12641: Authentication service failed to initialize
remote: sqlplus sys@tnsname as sysdba	ok	ORA-12638: Credential retrieval failed	ORA-12638: Credential retrieval failed
local: sqlplus system	ok	ok	ORA-12641: Authentication service failed to initialize
local: sqlplus system@tnsname	ok	ok	ORA-12641: Authentication service failed to initialize
remote: sqlplus system@tnsname	ok	ORA-12638: Credential retrieval failed	ORA-12638: Credential retrieval failed

for ORA-1031: Insufficient Privileges, check the following Oracle support document:

Troubleshooting ORA-1031: Insufficient Privileges While Connecting As SYSDBA (Doc ID 730067.1)