Hi everyone,

I'm in desperate need of help here, I'm about to pull my hair out over this
one.

I wrote a serviced component in C#, which basically just performs System.IO
operations like File.Exists, Directory.Exists, etc. The reason I wrote this
is to allow me to retreive and query the file system on UNC paths from
asp.net. This all worked great from my intranet site which uses windows
authentication and impersonation; allowing me to only have to worry about
the permissions of the configured com+ server identity.

Now I need to use the same functionality for our public site. This site uses
forms authentication and a custom principal class to manage the roles of the
user. The problem is that I get the error:

QueryInterface for interface UncDataManager.IUncDataManager failed.

at the point that I call a method on my serviced component. What really gets
me is that if I change my web.config to allow anonymous users, and then turn
impersonation on, using my own windows credentials (I explicitly specify
them in web.config), my serviced component runs just fine.

Digging into MSDN I found that the serviced component will be invoked by the
current Win32 thread identity, which can be seen by doing a
WindowsIdentity.GetCurrent(). With forms authentication, this should be
equal to the processModel account, which I verified to be true. My
processModel identity is a domain account which has read/write permissions
to all the necessary directories. I even tried adding the processModel
account to the local administrators group, but still no luck.

Something sure doesn't seem right here, (especially since it works when I
use impersonation), but I'm out of ideas. I've even tried using a
WindowsImpersonationContext to impersonate the WindowsIdentity.GetCurrent()
account (the processModel account) before making a call to to the serviced
component method, but that didn't work either.

Please help!!!
-Brian