Microsoft KB Archive/176439

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BUG: InternetSetOption Does Not Set Credentials for NTLM Scheme

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Q176439

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The information in this article applies to:


 * Microsoft Internet Explorer (Programming) version 3.0

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SYMPTOMS
The InternetSetOption API does not work for the following options when used with NTLM authentication:


 * INTERNET_OPTION_USERNAME
 * INTERNET_OPTION_PASSWORD

It is not possible to set credentials with this API when using NTLM authentication.

RESOLUTION
Use InternetErrorDlg to set credentials for NTLM scheme, or ensure that the client computer has Internet Explorer 4.0 installed.

STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

This problem has been fixed in the Internet Client SDK, synchronized with Internet Explorer 4.0.

MORE INFORMATION
When the WinInet.dll from Internet Explorer 4.0 is used, the username and password can be set on handles returned from InternetConnect and HttpOpenRequest.