role tailerod client can't be connected to demodb

This is the user who installed the NAV db server and App srever.
Any how I manage to set up some of the parameter given in Walkthrough: Installing the Three Tiers on Three Computers document and now I ended up with this error massage

''The login failed when connecting to the SQL server DB6"'

where DB6 is the SQL server Name.

I did not perform LAST part of the Walkthrough: Installing the Three Tiers on Three Computers document. that is

To delegate access to the SQL Server service>>> http://msdn.microsoft.com/en-us/library/dd301254.aspx

step 9.>>>> I can't see MSSQLsvr service is running when I click users or computers
what will be the possible reasons for that



Thanx

NO.. that is active directory server .but it is not listing srevices when i click on users ansd computers step 8 and then I can't see MSSQLSvc,.....

To delegate access to the SQL Server service
1. Click Start, and then click Run.

2. In the Open field, type dsa.msc.

This opens the Active Directory Users and Computers utility.

3.Right-click the node for the domain where you have installed Microsoft Dynamics NAV, and then click Find.

4. In the Find Users, Contacts, and Group dialog box, type the name of the domain user in the Name field, and then press ENTER.

5. In the Search results area, right-click the domain user, and then click Properties.

6. On the Delegation tab, click Trust this user for delegation to specified services only, and then click Use Kerberos only.

There is also the option to not restrict authorization to Kerberos, though the environment is not as secure when you are less restrictive. Your decision on this point must be reflect in the value you assign to the AllowNtlm setting in the RoleTailored client configuration file (ClientUserSettings.config). See Configuring the RoleTailored Client for details.

7. Click Add to open the Add Services dialog box.

8. Click Users or Computers, and then specify the domain user.

9. In the list of services for the domain user, click MSSQLSvc, which is the SQL Server service.


Thnkx

10. Click OK to close the Add Services dialog box. Continue clicking OK to close all open dialog boxes