Anyone want a tough question? Well here it is. <BR><BR>I am trying to tie two sites together using Active Directory. One is ASP.NET based using Active Directory to authenticate its users. And the Second is PHP Unix based (soon to be) using Active Directory to authenticate its users.<BR><BR>The problem comes in that I want a user authenticated by one site to be able to enter the other site without being challenged again for authentication. Each one uses (or will use) Active Directory to authenticate each user. So what is the process to cross platform authenticate? Do I somehow pass the Authentication Ticket? If so, can someone give me a good example of this that can be replicated?<BR><BR>Thanks!<BR>Wynter