This article was previously published under Q171307
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IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
On a computer running Windows NT Server, if Gateway Services for NetWare(GSNW) is installed, a SAP Type 640 broadcasts every 60 seconds by theremote procedure call (RPC) service. This SAP broadcast continues evenif the user disables the GSNW and the SAP Agent Service.
On a computer running Windows NT Workstation, the RPC service does theSAP broadcast if the Client Services for NetWare (CSNW) and the SAP Agentservice are installed. This SAP broadcast continues even if the userdisables the SAP agent.
By default, the RPC service checks for the presence of GatewayServices for NetWare and the SAP Agent service on the computer runningWindows NT Server.
On the computer running Windows NT Workstation with CSNW, the RPC servicechecks for the SAP Agent service. If the services are present, RPC starts its own thread that does the SAP broadcast Type 640 every minute.
Windows NT Server 4.0, Terminal Server Edition
To resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
Windows NT Server or Workstation 4.0
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:
152734how to obtain the latest windows nt 4.0 service pack
For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:
Microsoft has confirmed that this is a problem in Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT Server 4.0, Terminal Server Edition Service Pack 6.
Windows NT 4.0
Microsoft has confirmed that this is a problem in Windows NT 4.0. This problem was first corrected in Windows NT 4.0 Service Pack 5.
After applying this fix, perform the steps below to create a new registryvalue.
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
Run Registry Editor (Regedt32.exe).
Go to the following key in the registry:
On the Edit menu, click Add Value and use the following entry:
Value Name: AdvertiseRpcService Data Type: REG_SZ String: No
Using No for the string turns RPC sapping off. Using Yes for the string turns RPC sapping on.
Restart the computer for the registry change to take effect.
If the SAP broadcasts continue after following these steps, you may want to disable SAP broadcasts as a troubleshooting step. To disable SAP broadcasts, delete the Ncacn_spx string value in following registry key: