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Registry errors message on internet: Access is denied due to invalid credentials

You are using Microsoft Internet Explorer on a Microsoft Windows XP-based computer. When you try to access a Web site that requires Kerberos authentication, you may receive the following error message:

HTTP Error 401 - Unauthorized: Access is denied due to invalid credentials.

Cause of Error

This problem may occur if the Web site uses a CNAME resource record in the Domain Name System (DNS) to contact the server that initiates Kerberos authentication. (This server also issues the Kerberos ticket.) When you use Internet Explorer to access the Web site, Internet Explorer uses the host name of the server instead of the CNAME resource record to contact the server. The authentication process does not work because only the Service Principal Name (SPN) for the CNAME resource record is registered on the account that is used for the authentication.

Solution 1: Fix "HTTP Error 401" manually

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

1. Exit Internet Explorer.
2. Click Start, click Run, type regedit, and then click OK.
3. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main

4. On the Edit menu, point to New, and then click Key.
5. Type FeatureControl, and then press ENTER.
6. With the FeatureControl registry subkey that you created in step 5 selected, point to New on the Edit menu, and then click Key.

7. Type FEATURE_USE_CNAME_FOR_SPN_KB911149, and then press ENTER.
8. With the FEATURE_USE_CNAME_FOR_SPN_KB911149 registry subkey selected that you created in step 7, point to New on the Edit menu, and then click DWORD Value.
9. Type Iexplore.exe, and then press ENTER.
10. Right-click Iexplore.exe, and then click Modify.
11. In the Value data box, type 1, and then click OK.
Note To revert to the previous behavior for backward compatibility, reset this value to 0x0.
12. Exit Registry Editor.

Solution 2: Fix "HTTP Error 401" automatically

Fix this Registry problem through registry repair software. Registry repair software fixes all your registry problems including all errors and instances of fragmentation.

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