Microsoft KB Archive/228393

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

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Q228393

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The information in this article applies to:


 * Microsoft Windows NT Server version 4.0
 * Microsoft Windows NT Workstation version 4.0

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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 : kbOSWinNT400 kbWinNT400sp5fix kbGrpDSCom kbwin32sdkfaq

Issue type : kbbug

Technology : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400xsearch kbWinNTSsearch kbWinNTS400xsearch kbWinNTS400