IIS won't forward the logged on user credential to webservice request?

Question

Ive enabled Windows authentication in my IIS.

for the sample lets assume my Active directory username is \domain\John

My task flow is like that :

Iis won't forward the loged on user credential to webservice request?

the Page1.aspx request some data from a WebService ( also in my iis ).

However , it does NOT pass the \domain\John Information . (through the request).

Other things are working well. ( I can touch a file with special permission via the impersonation)

But when the asp.net calls the webservice - it fails ( 401 - not autorized).

p.s.

If i set ...useDefaultCredentials = true ( in my c# code) - its working.

I want the IIS to "forward the \domain\John" with the request of the webservice.

How can I do that ?

Answer 1

This is a better question for Serverfault.

What you need to do for this to be workable is to configure Constrained Delegation. With a regular NTLM logon, your credentials aren't forwardable to another service.

With a Basic (you may need to change the LogonType value to allow it) logon, you could do this because the target server has your credentials; with NTLM, it's not able to make the second hop.