Secure RPC Traffic Problem When Using RPC Ping Tool

ID: Q240452

The information in this article applies to:

Microsoft Windows NT Server version 4.0

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

The remote procedure call (RPC) Ping tool may not work when the Run with Security option is selected.

CAUSE

This behavior occurs because the NT LM Security Support Provider service could not start. Note that if you attempt to start the NT LM Security Support Provider service by using the Services tool in Control Panel, you may receive the following error message:

Error 1058: The specified service is disabled and cannot be started.

WORKAROUND

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. If you are running Windows NT, you should also update your Emergency Repair Disk (ERD).

Start Registry Editor (Regedt32.exe).

Locate the values under the following key in the registry:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_NTLMSSP

If the values under this key are missing or corrupted, delete the key (LEGACY_NTLMSSP).

Quit Registry Editor.

Restart the computer.

MORE INFORMATION

The RPC Ping utility is often used to check RPC connectivity problems when you are troubleshooting Microsoft Outlook/Microsoft Exchange client-server communications.

Outlook/Exchange clients use a secure RPC connection when connecting to an Exchange server. When you are testing with the RPC Ping tool (Rpingc32.exe), the Run with Security option is often used to make sure a secure RPC connection can be made with the server.

If the RPC test without selecting the Run with Security option works, but does not work if security is used, verify whether the NT LM Security Support Provider service is started or can be started manually.

When you use Network Monitor to capture network traffic, you may not see any network traffic coming from a client having this problem.

Additional query words: rpings.exe

Keywords : kberrmsg kbtool
Version : winnt:4.0
Platform : winnt
Issue type : kbprb