Cannot Use RFC 1867 Over Proxy Server to Upload a Large File with NTLM Authentication

• Microsoft Internet Explorer versions 4.0, 4.01, 4.01 Service Pack 1 for Windows 95

SYMPTOMS

You may not be able to upload a large file using NTLM authentication through Microsoft Proxy Server to a Web server using Basic authentication.

CAUSE

For file downloads and ASP requests, Internet Explorer sends both a "Proxy-Authorization: NTLM xxx" and an "Authorization: Basic: xxx" HTTP header upon every "407 Proxy authentication required" response from Proxy Server. Problems arise if a large amount of data is posted.

The client first posts the data to Proxy Server, including an "Authorization: Basic: xxx" HTTP header as expected. Proxy Server replies with "407 Proxy authentication required," as expected. The client then posts the data again, but with an "Authorization: Basic: xxx" HTTP header, leaving out the needed "Proxy-Authorization" HTTP header.

Proxy Server then replies again with "407 Proxy authentication required" because the authentication request was not honored. At this point, Internet Explorer generates the error message "Internet Explorer cannot open the Internet site name. Not enough storage is available to process this command."

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

STATUS

Microsoft has confirmed this to be a problem in Microsoft Internet Explorer version 4.01.

This problem has been fixed in Internet Explorer 4.01 SP2 and Internet Explorer 5.

Additional query words:

Keywords : kbenv kberrmsg msiew95
Version : WINDOWS:4.0,4.01,4.01 Service Pack 1
Platform : WINDOWS
Issue type : kbprb