Database Software

Hello,

I try to install Oracle 11.2.0.1 on Windows 2008 R2 x64 cluster (two nodes).

I did next steps:
1) install Windows (Windows 2008 R2 x64)
2) create domain
3) install cluster on two nodes
4) install Oracle Database Software (v. 11.2.0.1)
5) install Oracle Fail Safe (v. 3.4.2)

Then I tried to add new database on first node. During creation there was error "ORA-12638". I resolved it by changed auth-mode (in SQLNET.ora) from "NTS" to "NONE".
So database was created.

Then I tried to add database into Oracle Fail Safe. During adding appered error "ORA-12638" again. I cancel adding.
Then I watched SQLNET.ora - there was "NTS, NONE" auth mode. It seems that Oracle Fail Safe Manager add "NTS" mode.
I deleted "NTS" and tried again. No effects. In SQLNET.ora there was "NTS, NONE" auth mode.

So I have next question:
1) what reason of adding "NTS" mode into SQLNEt.ora? May be possible to disable adding "NTS" mode?
2) why NTS mode does not work. In one document I found that it is Windows API error.

It is strange for me, because on this cluster I have added other database some days ago. Then I remove database from Fail Safe. Now I try to add other new database and I have the problem.