using windows authentication for services

[JatinPatel]

I have a webapp that uses form authentication to restrict what a user can and cannot do. Hence on my IIS, authentication is set to Form Authentication and Windows Auth is disabled.
But for my mapservices, they are using windows authentication.
So now when i open the site, it asks me to login using form auth and then when it tries to load the maps and layers, it is asking me for windows account credentials.

Is there a way to auto-get the windows credentials instead of having to enter is manually since the user is already logged into the system.

I tried enabling windows auth in IIS, but apparently it does not like both forms and windows auth enabled at same time.

Is there a way to achive it?
Thanks

[ThaoLe]

Have you tried setting Windows Authentication only for the map services and use Forms authentication only for your application? You should be able to choose which authentication method is used for every application in IIS.