Article ID: 251404 - Last Review: November 10, 2011 - Revision: 2.0

You cannot post data to a non-NTLM-authenticated Web site

View products that this article applies to.
System TipThis article applies to a different operating system than the one you are using. Article content that may not be relevant to you is disabled.
This article was previously published under Q251404
Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986  (http://support.microsoft.com/kb/256986/ ) Description of the Microsoft Windows Registry
Expand all | Collapse all

SYMPTOMS

You cannot post any data to non-NTLM authenticated Web sites.
Back to the top

CAUSE

This issue can occur after you visit an NTLM authenticated folder.

Note Microsoft Internet Explorer requires NTLM authentication for all visits after you visit one NTLM authenticated folder.
Back to the top

RESOLUTION

Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

To resolve this issue from the client side, use Registry Editor (Regedt32.exe) to add a value to the following registry key:
HKEY_CURRENT_USER/Software/Microsoft/Windows/CurrentVersion/Internet Settings/
Note The above registry key is one path; it has been wrapped for readability.

Add the following registry value:
Value Name: DisableNTLMPreAuth
Data Type: REG_DWORD
Value: 1
In addition to the registry key you also need to turn off Enable Integrated Windows Authentication in Internet Explorer. To do this, follow these steps:
  1. Start Internet Explorer.
  2. Click Tools, click Internet Options, and then click the Advanced tab.
  3. Under Security, click to de-select Enable Integrated Windows Authentication (requires restart), and then click Apply.
  4. Close Internet Explorer.
To resolve this issue from the server side, configure the Web site to use either of the following authentication methods:
  • Configure the Web site to permit anonymous access only.
  • Configure the Web site to permit both anonymous access and NLTM authentication (Integrated Windows authentication).
For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
324274  (http://support.microsoft.com/kb/324274/ ) How to configure IIS Web site authentication in Windows Server 2003
310344  (http://support.microsoft.com/kb/310344/ ) How to configure IIS 5.0 Web site authentication in Windows 2000
Back to the top

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Back to the top
APPLIES TO
  • Microsoft Internet Explorer 6.0
  • Windows Internet Explorer 7
  • Windows Internet Explorer 8
  • Windows Internet Explorer 9
  • Microsoft Internet Information Services 5.0
  • Microsoft Internet Information Services 6.0
  • Microsoft Internet Information Services 7.0
  • Microsoft Internet Information Services 7.5
Back to the top
Keywords: 
kbnetwork kbprb KB251404
Back to the top