Enable "Pass-through" Authentication

Enable "Pass-through" Authentication

hi,

I was trying to ebnable  Enable "Pass-through" Authentication. 
I configured all the required settings in Active Directory Section a
I enabled pass-through authentication but while i logi to a system as a
 domain user into a computer which is joined yo the domain
it required authentication before the servicedesk page appears


while i enter the user name and password to goes to the login page of the service desk
and i need to lenter the username and password again

could you please tell me why is that and what should i do to solve it

regards

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