Impersonation error "A required privillege is not held by the client"

From: Hethu Nanayakara (hethu@lanka.com)
Date: 12/30/02 

From: "Hethu Nanayakara" <hethu@lanka.com>
Date: Mon, 30 Dec 2002 16:38:12 +0600

I want to access a UNC shared folder from a WebService.
To do this, I impersonate the Asp.NET process in Web.config as below:

    <identity impersonate="true" userName="domain\username" password="password" />

The user has Admin rights on the local machine.

However, this generates the following error:

"Could not create Windows user token from the credentials specified in the config file. Error from the operating system 'A required privilege is not held by the client."

Can anyone tell me what I am doing wrong here?
Thanks
Hethu

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