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

ID: Q228393

The information in this article applies to:

Microsoft Windows NT 4.0

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, please see the following article in the Microsoft Knowledge Base:

Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

STATUS

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

Additional query words:


Keywords          : kbNTOS400 nt4sp5fix kbGrpCom 
Version           : winnt:4.0
Platform          : winnt 
Issue type        : kbbug

Last Reviewed: June 22, 1999