RPC UseWinsockForIP Is Only Applicable to UDP and IPX (186357)
The information in this article applies to:
- Microsoft Windows NT Server 4.0 Terminal Server Edition
- Microsoft Windows NT Server 4.0 SP2
- Microsoft Windows NT Server 4.0 SP3
- Microsoft Windows NT Workstation 4.0 SP2
- Microsoft Windows NT Workstation 4.0 SP3
- Microsoft Windows NT Server, Enterprise Edition 4.0
This article was previously published under Q186357
IMPORTANT: This article contains information about editing the registry.
Before you edit the registry, make sure you understand how to restore it if
a problem occurs. For information about how to do this, view the "Restoring
the Registry" Help topic in Regedit.exe or the "Restoring a Registry Key"
Help topic in Regedt32.exe.
SYMPTOMS
Winsock Proxy lets a Windows Sockets application, running on a private
network client, behave as if it were directly connected to a remote
Internet server application when, in fact, the Microsoft Proxy Server is
the host for this connection. This means that all application-level
communications are channeled through a single secured computer -- the
gateway computer running Microsoft Proxy Server.
Ordinarily, for datagram packet transfers, the RPC transport DLL bypasses
the sendto( ) and recvfrom( ) functions provided in Wsock32.dll, and
communicates directly with the underlying device driver. This improves the
speed of packet transfers but makes Winsock Proxy features unavailable to
the application.
Effective with Windows NT 4.0 with Service Pack 2, the RPC transport checks
the registry to see whether to use the function calls provided in
Wsock32.dll or to talk directly with the device driver.
NOTE: To use RPC with Winsock Proxy, you must add the following information
to the registry:
WARNING: Using Registry Editor incorrectly can cause serious problems that
may require you to reinstall your operating system. Microsoft cannot
guarantee that problems resulting from the incorrect use of Registry Editor
can be solved. Use Registry Editor at your own risk.
For information about how to edit the registry, view the "Changing Keys And
Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete
Information in the Registry" and "Edit Registry Data" Help topics in
Regedt32.exe. Note that you should back up the registry before you edit it.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\UseWinsockForIP
REG_DWORD "1"CAUSE
RPC on Windows NT uses optimization for connection oriented traffic. This
optimization includes calling the TDI transport. As a result, RPC bypasses
the Winsock proxy.
RESOLUTIONTo resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. 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
After you obtain the latest service pack, perform the following steps:
WARNING: Using Registry Editor incorrectly can cause serious problems that
may require you to reinstall your operating system. Microsoft cannot
guarantee that problems resulting from the incorrect use of Registry Editor
can be solved. Use Registry Editor at your own risk.
For information about how to edit the registry, view the "Changing Keys And
Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete
Information in the Registry" and "Edit Registry Data" Help topics in
Regedt32.exe. Note that you should back up the registry before you edit it.
- Apply Windows NT 4.0 Service Pack 4.
NOTE: The third-party application must also be a Winsock 2.1 LSP
(layered service provider). - Copy the %SystemRoot%\System32\Rpcltscm.dll file to another name (for
example, Rpclts13.dll).
- For the protocol that is being implemented by the LSP (for example,
TCP/IP), replace the reference to Rpcltscm.dll in the registry with the
above name. For example,
change:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ServerProtocols
\ncacn_ip_tcp=rpcltscm.d
to:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ServerProtocols
\ncacn_ip_tcp=rpclts13.d - Shut down and restart your computer.
STATUSMicrosoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.
| Modification Type: | Major | Last Reviewed: | 6/30/2004 |
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| Keywords: | kbFEA kbinfo KB186357 |
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