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Q261129: DLC Connection Stays Pending Due to Bit-Flipped TEST Poll

Article: Q261129
Product(s): Microsoft SNA Server
Version(s): 2.11 SP1,2.11 SP2,3.0 SP1,3.0 SP2,3.0 SP3,3.0 SP4,4.0,4.0 SP1,4.0 SP2,4.0 SP3
Operating System(s): 
Keyword(s): kbsna211sp1 kbsna211sp2 kbsna300sp1 kbsna300sp2 kbsna300sp3 kbsna300sp4 sna4 kbsna400sp
Last Modified: 11-JUN-2002

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The information in this article applies to:

- Microsoft SNA Server, versions 2.11 SP1, 2.11 SP2, 3.0 SP1, 3.0 SP2, 3.0 SP3, 3.0 SP4, 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3 
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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:

  Q256986 Description of the Microsoft Windows Registry

SUMMARY
=======

By default, during 802.2 connection startup, a computer running SNA Server on an
Ethernet network tests link station-to-link station connectivity by sending four
LLC test commands (both 802.3 and DIX frame types to both the configured and
bit-flipped Media Access Control [MAC] addresses). For additional information on
this process , click the article number below to view the article in the
Microsoft Knowledge Base:

  Q123791 SNA Server Remote Station Discovery Process

In some environments, it may be necessary to force test commands to only be sent
to one of these two addresses. A registry entry is available for controlling
this process. For information on how to do this, see the "More Information"
section.

MORE INFORMATION
================

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.

1. Start Registry Editor (Regedt32.exe).

2. Locate the following key in the registry:

  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\SNADLC?\Parameters\ExtraParameters

  NOTE: SNADLC? is the link service used by the connection, and needs
  bit-flipped TEST polls disabled.

3. On the Edit menu, click Add Value, and then add the following registry value:

  Value Name: DisableFlipping
  Data Type: REG_DWORD
  Value: 1 (valid values are 0=enable both configured and bit-flipped addresses
  to be sent; or 1=send only bit-flipped address)

4. Quit Registry Editor.

After a test response is received, the next step in the connection process is for
SNA Server to send an XID request. SNA Server sends the XID request to the
address in the first test response that it receives. In some environments,
responses are received on both the configured and bit-flipped addresses. If the
first response received is not from the intended mainframe device or AS/400
computer, SNA Server cannot establish a connection with that device, and the
connection status stays pending.

REFERENCES
==========

  Q123791 SNA Server Remote Station Discovery Process

Additional query words:

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Keywords          : kbsna211sp1 kbsna211sp2 kbsna300sp1 kbsna300sp2 kbsna300sp3 kbsna300sp4 sna4 kbsna400sp1 kbsna400sp2 kbsna400sp3 
Technology        : kbAudDeveloper kbSNAServSearch kbSNAServ400 kbSNAServ211SP1 kbSNAServ211SP2 kbSNAServ300SP3 kbSNAServ300SP1 kbSNAServ400SP1 kbSNAServ400SP2 kbSNAServ400SP3 kbSNAServ300SP2 kbSNAServ300SP4
Version           : :2.11 SP1,2.11 SP2,3.0 SP1,3.0 SP2,3.0 SP3,3.0 SP4,4.0,4.0 SP1,4.0 SP2,4.0 SP3
Issue type        : kbprb

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