We have many web applications which use Windows Authentication - this works absolutly fine for us. We have now merged our IT with another business and have trusted their domain, but users accessing applications in our domain are now prompted for credentials. they add the credentials for the new domain and everything works fine - so why is it prompting if their creds are fine?
Please ask if there is more information required - not sure if this is a simple question where many more details are required!
cheers