Microsoft KB Archive/150832

= Unable to Connect to a Lotus Notes Server Over Router =

Article ID: 150832

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.1
 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51
 * Microsoft Windows for Workgroups 3.11
 * Microsoft Windows 95

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This article was previously published under Q150832



SYMPTOMS
A Lotus Notes client on a Windows NT or Windows 95 computer using NetBIOS and NWLink on Token Ring may fail to connect to a Lotus Notes server on Ethernet. This symptom can also occur when a Notes client is on a FDDI ring.



CAUSE
The network adapter on one side of the conversation is on a link that has a larger frame size than the link on the other side, and IPX does not do fragmentation. According to the IPX specification, it is up to a higher level to determine the maximum transmit unit (MTU). For NetBIOS traffic over IPX there is no MTU negotiation scheme.



WORKAROUND
To work around this problem, decrease the frame size of the Token Ring network adapter to 1,012 bytes on the Windows NT computer.

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.


 * 1) Run Registry Editor (REGEDT32.EXE).
 * 2) From the HKEY_LOCAL_MACHINE subtree, go to the following key:

\SYSTEM\CURRENTCONTROLSET\SERVICES\NWRDR\PARAMETERS
 * 1) Set DefaultMaxPacketSize (reg_dword), to 1012 (decimal).

For additional information about configuring Lotus Notes clients on Windows, please see the following article in the Microsoft Knowledge Base:

104944Configuring Lotus Notes Client on Windows NT Using NWLINK

Additional query words: prodnt ipx spx nwlink router ethernet tokenring packet frame drop

Keywords: KB150832

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