2003 Service Pack 1 and SQL Server Reporting Services
After applying Service Pack 1 for Windows Server 2003, we found that the Reports folder on our SQL Server Reporting Services web site would return a 401: Unauthorised error. We knew that everything was working ok before hand so it must have been a security change in the Service Pack that caused the problem. We reported this issue to Microsoft and sent through several log files.
As usual, Microsoft’s technical support was first class and we had a solution the next day. It turns out that Service Pack 1 has an update which is designed to detect and prevent “man-in-the-middle” attacks. There were two suggested fixes for this. The first was to run the Reports and ReportsServer virtual directories under the Default App Pool. We tried this and it didn’t work for us.
The second was to add a DWORD entry called DisableLoopbackCheck to HKLM\System\CurrentControlSet\Control\Lsa. Setting this key to a value of 1 fixed our issue.
Our concern was that this would leave us open to attack but we decided that this attack vector was pretty slim (for us).
posted by Flarepath | 12:28 PM
17 Comments:
Thank you for the posting as I had the exact same error with RS after installing Win2k3 SP1. I've added the reg entry as described and RS Manager is responding once again.
Great!
It works for mine too!
Thanks a lot!
Brilliant!!!!
After nearly a whole day spent trying to figure this out through various means, i finally trudged deep enough through Google's results to find a link to your page.
Works great! Thanks a ton for the help!
By the way, do you have any more details on this "man in the middle" attack and what holes we may have opened by making this change?
(Hopefully by linking to it from my post on my blog, we can increase the PageRank your post and get some more people help on this matter quicker.)
Thanks for this! Saved me a lot of time.
Thanks, I resolved the problem so easy which could had need a lot time.
Many thanks for the post. We were really scratching our heads on this one.
Has anyone seen anything official on this yet?
That did the trick. I set it to use the default app pool and everything worked. Thanks!
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