Windows authentication/impersonation.. login failed for user null?

From: "Not Me" <Not.Me@xxxxxxxxxxxxxxx>
Date: Tue, 19 Dec 2006 15:44:41 -0000

Hey,

We have an sql server 2000 machine and IIS 6 machine running seperately
but on the same domain. I can connect fine to the database without using
impersonation, but when it's enabled I get the error:
"Login failed for user '(null)'. Reason: Not associated with a trusted SQL
Server connection."

When I check System.Security.Principal.WindowsIdentity.GetCurrent().Name I
get the valid domain user that I would expect, why isn't this user being
checked against the sql server?

cheers for any help,
Chris

.

Follow-Ups:
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  - From: Norman Yuan
- Re: Windows authentication/impersonation.. login failed for user null?
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