SMS: Netspeed.dat File Is Compressible

ID: Q192494

The information in this article applies to:

Microsoft Systems Management Server version 1.2

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

If you configure your Systems Management Server site settings to prevent clients from taking inventory over a slow link, inventory may still be taken if your modem has compression enabled.

CAUSE

When you take inventory, Netspeed.com attempts to determine the link speed by reading the file Netspeed.dat across the client connection. A total of 3,400 bytes are read from Netspeed.dat on the logon server. The speed is measured in the number of milliseconds to read the total bytes. The default of 3,400 bytes within 850 milliseconds indicates a fast link. If it takes 850 milliseconds or longer, it is considered a slow link.

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).

You may adjust the default 850 millisecond threshold by modifying a registry key.

Start Registry Editor (Regedt32.exe).

Locate the Slow Net Threshold Speed value under the following key in the registry:
```
      HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Systems Management Server
      \Components\SMS_Maintenance_Manager\Slow Net Threshold Speed 
```
NOTE: The above registry key is one path; it has been wrapped for readability.

On the Edit menu, click DWORD, type a value appropriate for your configuration, and then click OK.

Quit Registry Editor.

For additional information about this registry value, please see the following article in the Microsoft Knowledge Base:

Q131011 SMS: Netspeed.com Internals

STATUS

Microsoft has confirmed this to be a problem in Systems Management Server version 1.2.

MORE INFORMATION

When Netspeed.com reads Netspeed.dat over a RAS connection using modem compression, the contents of the Netspeed.dat file may be compressed to a smaller size, allowing Netspeed.com to misinterpret the speed of the RAS link.

For additional information, please see the following article in the Microsoft Knowledge Base:

Q142267 SMS: Netspeed Returns False Speed Over Compression-Capable Link

Additional query words: prodsms

Keywords : smsremtshoot kbbug1.20
Version : winnt:1.2
Platform : winnt
Issue type : kbbug