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Article ID: 171307 - Last Review: November 1, 2006 - Revision: 1.6
How to Disable SAP Broadcast for RPC Service
This article was previously published under Q171307
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:
256986Â
(http://kbalertz.com/Feedback.aspx?kbNumber=256986/EN-US/
)
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 the
remote procedure call (RPC) service. This SAP broadcast continues even
if the user disables the GSNW and the SAP Agent Service.
On a computer running Windows NT Workstation, the RPC service does the
SAP broadcast if the Client Services for NetWare (CSNW) and the SAP Agent
service are installed. This SAP broadcast continues even if the user
disables the SAP agent.
By default, the RPC service checks 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 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 the
Microsoft Knowledge Base:
152734Â
(http://kbalertz.com/Feedback.aspx?kbNumber=152734/EN-US/
)
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:
- 152734Â
(http://kbalertz.com/Feedback.aspx?kbNumber=152734/EN-US/
)
how 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:
Windows NT Server 4.0, Terminal Server Edition
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 registry
value.
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:
HKEY_LOCAL_MACHINE\Software\Microsoft\RPC
- 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:
HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\ServerProtocols\
: This should be used only as a troubleshooting step. Deleting
this string value completely disables SAP broadcasts which some programs
may need in order to function properly.
For additional information about, please see the following article in the
Microsoft Knowledge Base:
142533Â
(http://kbalertz.com/Feedback.aspx?kbNumber=142533/EN-US/
)
0x640 SAP Packets
Increase Using Remote Registry Service
APPLIES TO
- Microsoft Windows NT Server 4.0, Terminal Server Edition
- Microsoft Windows NT Workstation 4.0 Developer Edition
- Microsoft Windows NT Server 4.0 Standard Edition
| kbhotfixserver kbqfe kbfix kbother kbprb KB171307 |
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