BUG: CIS (DCOM Over HTTP) Broken in SP4 When Tunneling Through Microsoft Proxy Server 2.0 (228393)

The information in this article applies to:

Microsoft Windows NT Server 4.0
Microsoft Windows NT Workstation 4.0

This article was previously published under Q228393

SYMPTOMS

When you use Microsoft COM Internet Services (CIS), also known as DCOM over HTTP, on a Windows NT-based computer to tunnel through Microsoft Proxy Server 2.0, you may receive an error message that the Remote Procedure Call (RPC) server is unavailable.

CAUSE

During an HTTP CONNECT sequence, RPC sends a "CONNECT server:80 HTTP/1.1" string, where server is the name (or TCP/IP address) of the proxy server. This is rejected by Proxy Server 2.0 as a "bad request" because this is not a valid request for HTTP version 1.1. The correct RPC request should be: "CONNECT server:80 HTTP/1.0", where server is the name (or TCP/IP address) of the proxy server.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows NT 4.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack

STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows NT 4.0 Service Pack 5.

Modification Type:	Major	Last Reviewed:	10/29/2003
Keywords:	kbbug kbFAQ kbpending KB228393