Re: Impersonation not working with WebClient...

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Date: Thu, 8 May 2003 19:20:06 +0300

I think, I got almost same situation: my asp.net app uses <identity
impersonate="true"/> and works fine when I get into it using IE from outer
machine. But when I do try to use url to my asp.net app from something like
download manager (my app provides the access to some documentation files) I
got this:

Http/1.1 401 Unauthorised
WWW-Authenticate: Negotiate
WWW-Authenticate: NTLM
Access denied.

(from download manager log).

ps. download manager runs on same machine under same account, as the web
browser, which authenticates just fine into same url and download the
docments...

HELP !!!

"DanB" <daniel_t_bolger@hotmail.com> wrote in message
news:9b5f19d7.0305052328.647987e2@posting.google.com...
> I have an ASP page on SERVERA which calls a third party COM Component
> to execute a search. The third party COM Component uses the user
> credentials of the thread it is executing in to connect to the
> database and execute the search. I have set up my IIS application on
> SERVERA for Windows Authentication and ensured "Allow Anonymous
> Authentication" is deselected in "Directory Security". I then tested
> by invoking the search from Internet Explorer on my workstation (let's
> call it MYWORKSTATION) as follows: http://SERVERA/MyApp/MySearch.asp -
> The impersontation works correctly.
>
> I am then creating a ASP.NET Web Application that executes searches
> across multiple search apps and aggregates the results. I have some
> code similar to the following, and have turned on Impersonation in
> web.config:
>
> System.Net.WebClient client = new WebClient();
> client.Credentials = CredentialCache.DefaultCredentials;
> byte []pageData = client.DownloadData("http://SERVERA/MpApp/MySearch.asp);
> ...
>
> When I run this ASP.NET Web Application from my machine, the search
> works. However, when I deployed this to a test server and ran it from
> there, it did not work. I keep getting a HTTP 401 on the DownloadData
> line...
>
> I initially thought it might have something to do with the TEST server
> setup. I checked to ensure Anonymous was turned off on the Virtual
> Directory for MyApp and it was. Windows Authentication was turned on
> for MyApp too.
>
> Then I thought maybe the impersonation wasn't working, so I used the
> following line of code to see:
> System.Security.Principal.WindowsIdentity.GetCurrent().Name
> sure enough, this returns my login name, so this proves Impersonation
> is working.
>
> I got someone else in my company to try the same steps. They first
> entered http://SERVERA/MyApp/MySearch.asp into the web browser on
> their machine. This worked for them, proving they had the appropriate
> permissions to access the search database. They then tried to the
> search aggregator from my machine (which worked for me also) using
> http://MYWORKSTATION/SearchAggregator/Default.aspx which didn't work
> for them. Running it from the test server didnt work for them either.
>
> I've also tried forcing impersonation for the code above by preceding
> it with:
> System.Security.Principal.WindowsImpersonationContext
> impersonationContext;
> impersonationContext =
> ((System.Security.Principal.WindowsIdentity)User.Identity).Impersonate();
> ... this doesn't work either :(
>
> I'm really quite perplexed! Any help would be greatly appreciated.
> Cheers,
> Dan.

• Previous message: Guy Collinson: "AuthenticateRequest Event Not Firing"
• In reply to: DanB: "Impersonation not working with WebClient..."
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