We are developing an intranet for my company. I would like to implement a single sign on service. We have Active Directory on one server and the intranet is being housed on a Redhat Linux server. When the internal user pulls up the intranet, I would like it to check to see if they successfully joined the domain when they logged into their personal machine, if so they do not need to log on to the intranet. Does anybody have any links to tutorials on this? Thanks!