How to Disable SAP Broadcast for RPC Service

• Microsoft Windows NT Workstation version 4.0
• 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 on how to do this, view the "Restoring the Registry" online Help topic in Regedit.exe or the "Restoring a Registry Key" online Help topic in Regedt32.exe.

SYMPTOMS

On a computer running Windows NT Server, if Gateway Services for NetWare (GSNW) is installed, a SAP Type 640 will broadcast every 60 seconds by the remote procedure call (RPC) service. This SAP broadcast will continue even if the user disables the GSNW and the SAP Agent Service.

On a computer running Windows NT Workstation, the RPC service will do the SAP broadcast if the Client Services for NetWare (CSNW) and the SAP Agent service are installed. This SAP broadcast will continue even if the user disables the SAP agent.

CAUSE

By default, the RPC service will check for the presence of Gateway Services for NetWare and the SAP Agent service on the computer running Windows NT Server.

On the computer running Windows NT Workstation with CSNW, the RPC service checks for the SAP Agent service. If the services are present, RPC will start its own thread that will do the SAP broadcast Type 640 every minute.

RESOLUTION

Obtain the following fix or wait for the next Windows NT service pack.

This fix should have the following timestamp:

   07/07/97  05:31 PM               104,720 Rpcss.exe (Intel)
   07/07/97  04:30 PM               187,152 Rpcss.exe (Alpha)

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall Windows. 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" online Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" online Help topics in Regedt32.exe. Note that you should back up the registry before you edit it.

1. Run Registry Editor (Regedt32.exe).

2. Go to the following key in the registry:

         HKEY_LOCAL_MACHINE\Software\Microsoft\RPC
   

3. On the Edit menu, click Add Value and use the following entry:

         Value Name: AdvertiseRpcService
         Data Type:  REG_SZ
         Value:      Yes | No
         Default:    Yes
   
         Description: This parameter determines the if RPC service will enable
         or disable the SAP broadcast.
   
   

4. Restart the computer for the registry change to take effect.

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 4.0. A supported fix is now available, but has not been fully regression tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.

Keywords          : kbbug4.00 kbfix4.00 NTSrvWkst kbother
Version           : WinNT:4.0
Platform          : winnt
Issue type        : kbbug
Solution Type     : kbfix