You can try this :
When running a Report from another machine, not the Report Server, it propts for Credentials
KBA-01018
Problem
FIX: 'HTTP error 401.1 - Unauthorized: Access is denied due to invalid credentials' error message if the Basic authentication Default Domain property is set to a backward slash character (\) in IIS.
When you run the report on the Report Server, it runs fine, but as soon as you run the report on the users machine, it give you the above error message.
Solution
To work around this behavior if you have multiple application pools that run under different domain user accounts, you must force IIS to use NTLM as your authentication mechanism if you want to use Integrated Windows authentication only. To do this, follow these steps on the server that is running IIS: 1. Start a command prompt.
2. Locate and then change to the directory that contains the Adsutil.vbs file. By default, this directory is C:\Inetpub\Adminscripts.
3. Type the following command, and then press ENTER:
cscript adsutil.vbs set w3svc/NTAuthenticationProv
4. To verify that the NtAuthenticationProviders metabase property is set to NTLM, type the following command, and then press ENTER:
cscript adsutil.vbs get w3svc/NTAuthenticationProv
The following text should be returned:
NTAuthenticationProviders : (STRING) 'NTLM'
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by: SOTGarmentsIndiaPrivateLimitedPosted on 2008-02-25 at 19:25:51ID: 20981363
can this help guentersbl og/archive /2006/04/2 1/ 75772.as px
http://geekswithblogs.net/