SMS: Netspeed Returns False Speed Over Compression-Capable Link

When a client computer connects to a Systems Management Server logon server using Remote Access Service (RAS), the inventory runs even though it is a slow network connection.

When Netspeed.com reads Netspeed.dat through a hardware or software compression-capable link, the contents of the file may be compressed which causes Netspeed to return a false speed reading.

For additional information about Netspeed errorlevels and troubleshooting, please see the following article in the Microsoft Knowledge Base:

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.

It may be possible to work around this problem by making the following adjustment in the registry:

1. Start Registry Editor (Regedt32.exe) and locate the following registry key:

         HKEY_LOCAL_MACHINE \SOFTWARE\Microsoft\SMS\Components
         \SMS_MAINTENANCE_MANAGER
   						

   NOTE: The above registry key is one path; it has been wrapped for readability.
2. Select the following entry: Slow Net Threshold Speed.
3. On the Edit menu, select DWORD.
4. Change the Data to 150 (decimal) (see paragraph below).
5. Click OK and quit Registry Editor.
6. At the next watchdog cycle, the Maintenance Manager service will generate a new Netspeed.com in the \SMS\Site.srv\Maincfg.box\client.src directory. This file will not be built in the Netlogon share and will not be copied there.
7. If necessary, copy the file to the login scripts directory.

The value that works best will depend on your network environment. This should be tested in two ways:

• Make certain that the Systems Management Server script still runs for clients not dialing in to your network. This is especially important in a wide area network (WAN) environment, make sure that remote sites are still being inventoried.
  
  -and-
• Test the fastest dial-up client so they are not inventoried. It may take several adjustments to locate the ideal threshold speed for your network environment.

When Smsls.bat or Smsls.cmd runs from a logon script, Netspeed.com and Netspeed.dat are used to determine if the network link is above a pre- defined speed threshold. Depending on the threshold speed set in the registry and the policy set in the Systems Management Server Administrator Tool, Smsls.bat or Smsls.cmd prompts the user to confirm whether they want inventory performed when a slow link is detected.

You can use the command to determine the link speed that Systems Management Server is using. The possible return values are as follows: NOTE: Because of file caching on some operating systems, netspeed.com /v will only return a valid result the first time it is run. Disconnecting and reestablishing the dial-up connection clears the file cache.