How to secure the WCF layer. basically only user ids authenticated by the web server should get access to the wcf services.

Question

I tried by creating Certificate at IIS but not able to get proper output as i want (to secure the WCF layer.  basically only user ids authenticated by the web server should get access to the wcf services) like any client want to access services by passing Service URL first ask Userid and Password to see services . please help me.


Windows server 2008 R2
IIS 7.5
Silverlight 4.0
C sharp.

Thanks.