Microsoft KB Archive/152121

= Windows NT Logon to NetWare Is Slow & Causes Event 8007 Errors =

Article ID: 152121

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.51

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This article was previously published under Q152121





SYMPTOMS
When you log on to a NetWare Server across a Novell router(s) (file servers or multi-protocol routers), it may be unusually slow and sometimes may take as long as 8 to 12 seconds. Event ID 8007 may also appear in the System log.



CAUSE
This may be due to the router(s) limiting the size of the packet you can use, particularly if this is a Token Ring network.

The response to a logon to a NetWare Server across a router may take several seconds (as long as 8 to 12), depending on how long it takes to negotiate the correct packet size to connect to the NetWare server.

You may also see a number of Event ID 8007 error messages in the Event Viewer right after logging on. The response time is long because Windows NT is negotiating the largest packet it can use to access the NetWare Server. If the packet size used by the adapter installed in Windows NT uses a packet size much larger than the router allows, Windows NT has to negotiate to find out how large a packet it can use.



RESOLUTION
To shorten the logon time:

 Configure the router to use the largest packet size possible on your network. Consider all circumstances that may require you to keep the packet size shorter. If you do not know the packet size your router is using consult the router manual or contact the router manufacturer, or continue with B below to experiment with different packet sizes. To eliminate packet size negotiations, configure Windows NT to use the packet size the router is set to.

WARNING: Using Registry Editor incorrectly can cause serious, system- wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.  Run the Registry Editor(REGEDT32.EXE). Under the HKEY_LOCAL_MACHINE subtree go to the following subkey:

\System\CurrentControlSet\Services\NwlnkIpx\NetConfig\AdapterName#  Check whether the entry MaxPktSize exists.  If the MaxPktSize entry exists, the value may be set to 0 (zero) which means that the packet size determined by the driver is used for the adapter and you need to change that value. Double-click the parameter value in the right window pane and skip to step 3.c.</li> If the MaxPktSize entry does not exist:  From the Edit menu, choose Add Value and add the following information when prompted:

Value Name: MaxPktSize

Data Type : REG_DWORD</li> Choose Ok.</li></ol> </li> In the DWORD Editor dialog box set the Data field to the packet size the router is configured for. If you are not sure what that is, you can test with various values to see what works best. It may be best to start with a value of 1024 (decimal) and work up or down from there.</li></ol> </li></ol>

This limits the negotiation process and should enable the logon to occur much faster. You should also see fewer 8007 errors.

<div class="status_section">

STATUS
Microsoft has confirmed this to be a problem in Windows NT version 3.51. This problem was corrected in the latest Windows NT 3.51 U.S. Service Pack. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Additional query words: prodnt

Keywords: kbnetwork KB152121

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