Hello, I have a C# client-side application that uses WCF to interact with a Sharepoint Server. The server sits behind ISA 2006 firewall. ISA 2006 implements Forms Based Authentication, with delegation of Ntlm, to my Sharepoint service. I am unable to understand how I can configure or implement my WCF-based client to authenticate with ISA 2006 FBA. In fact, I see no information at all that discusses Forms Based Authentication vis. WCF. Any guidance or advice offered would be greatly appreciated.

Try this http://msdn.microsoft.com/en-us/library/bb975135(office.12).aspx#MOSSFBAPart2_UsingWebServices . Oleg