thx alot Sebastian ,

i enabled the active directory, and i have configured my site.but now i'm facing a new problem ,  is that the other user can't log in

thx for your help

thanks Mike for teh reply.

i did all the steps. just except the one in Windows authentication, where i should enter the user name and pass.

because i don't want that  all user loged to DNN, login to the Database as they are 1 user (the one i entered in Windows Authetication).

when i first logged in , i inserted my username : Domain/username  , and my password,

when DNN opened , i was logged in,

i found that there was a creation of a new user,called : Domain/user name that i had inserted first...Just like i wanted to.

But now other users can't log in , only me the first user that logged in.when they try to log in , the DNN won't open

and take a lot of time.