Re: 401 Unauthorized trying to read SPList Attachment - owssrv.dll

• Previous message: David Wang [Msft]: "Re: Problem with Integrated Windows authentication on SSL connection - second times"
• In reply to: Chris Kane: "Re: 401 Unauthorized trying to read SPList Attachment - owssrv.dll"
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Date: Wed, 27 Apr 2005 22:44:03 -0700

Chris,

This sounds like a good approach. If you use the WebRequest be sure to set
it's credentials. Alternatively, a better way may be to get the SPFile object
of the ListItem. I do this in my PortalTools project in creating a disk based
package of document libraries (url is below).

Daniel Larson
http://www.portalbuilder.org
http://workspaces.gotdotnet.com/portaltools

"Chris Kane" wrote:

> Okay, thanks. We store XML documents as SPListItem attachments that are to
> be processed by our workflow application. We attempted to pass the
> attachment's URI directly to the XPathDocument class constructor in
> preparation for transforming it via XSL. This is where we originally
> received the 401 from IIS. I can see how we could retrieve the attachemnt
> using the HTTPWebResponse object and then pass this into the XPathDocument
> class as a stream. Is this the best way to do this?
>
> Thanks for your help!
>
> "David Wang [Msft]" wrote:
>
> > IIS does not see your impersonated user because you failed to authenticate
> > as that user.
> >
> > Remember that we are talking about HTTP, which has its own publicly defined
> > authentication protocols. Client-side impersonation isn't one of them. The
> > identity of the user on the client, impersonated or not, means ABSOLUTELY
> > NOTHING on the server unless you negotiate HTTP authentication of some sort.
> >
> > IE, for example, does this authentication behind the scenes without you
> > noticing. So do many of the Windows programs and protocols. This isn't how
> > the web and HTTP works, though, and you just have to follow the rules.
> >
> > --
> > //David
> > IIS
> > http://blogs.msdn.com/David.Wang
> > This posting is provided "AS IS" with no warranties, and confers no rights.
> > //
> > "Chris Kane" <ChrisKane@discussions.microsoft.com> wrote in message
> > news:3DA9A3DB-FD45-436E-99B5-265B002F81B3@microsoft.com...
> > We have written a class that enumerates the items in a WSS list and then
> > attemptes to open the attachment for each item. We have written two
> > classes,
> > one to impersonate a user and read in the list information and the other to
> > be called by the first which actually opens the attachment. Our code fails
> > when it tries to open the attachment in the second class with a 401 -
> > Unauthorized error from IIS on http://localhost/_vti_bin/owssrv.dll. What's
> > strange is that I can use IE to open the URL to the attachemnt without any
> > problems. I noticed in the IIS logs that when I open the URL, I can see the
> > domain\password passed to IIS from IE. However, when our code tries to
> > access the same URL, no user information is passed, causing the 401. We
> > have
> > impersonated a valid user in our code, so why does IIS not see it?
> >
> > Thanks!
> >
> >
> >

• Previous message: David Wang [Msft]: "Re: Problem with Integrated Windows authentication on SSL connection - second times"
• In reply to: Chris Kane: "Re: 401 Unauthorized trying to read SPList Attachment - owssrv.dll"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]