SNA Server Allows Range of IP Ports With Distributed Link Service

ID: Q224303

The information in this article applies to:
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.

SUMMARY

If a connection is configured to activate "On Demand" or "By Administrator," the node will issue an initial Open Link request. When the connection is activated, the node issues a Close Link request, then an Open Link request for the actual connection. If a distributed link service (DLS) is configured to use a fixed IP port number through the LocalIPport registry entry, the second Open Link request will fail because the port will be in a Time_Wait state from the first Open/Close Link request.

A new registry entry has been added to allow a range of IP ports. This registry entry is necessary to allow the connection to recover or be recycled in a timely fashion. The remote link service will cycle through the range of ports specified in LocalIPPortRange until it either finds a free port or has exhausted all ports in the specified range. To add this registry key, perform the following steps:

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).

  1. Start Registry Editor (Regedt32.exe).


  2. Locate the following key in the registry:


    3. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\SnaRemx\Parameters\SnaTCP
  3. On the Edit menu, click Add Value, and then add the following registry value:


    4. Value Name: LocalIPPortRange
    Data Type: REG_DWORD
    Value: 1 (The default value is 1.)
  4. Quit Registry Editor.



MORE INFORMATION

SNA Server 4.0

This supported feature is now available from Microsoft, but has not been fully regression tested and should be applied only to systems having a specific need for it. If you are not severely affected by the lack of this feature, Microsoft recommends that you wait for the next Microsoft SNA Server version 4.0 service pack that contains this feature.

To obtain this feature immediately, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:
http://www.microsoft.com/support/supportnet/overview/overview.asp
The English version of this feature should have the following file attributes or later:

File name Date Time
Snaip.dll 04/14/99 08:26

NOTE: Because of file dependencies, the most recent fix that contains the above files may also contain additional files.

NOTE: If this product was already installed on your computer when you purchased it from the Original Equipment Manufacturer (OEM) and you need this feature, please call the Pay Per Incident number listed on the above Web site. If you contact Microsoft to obtain this feature, and if it is determined that you only require the feature you requested, no fee will be charged. However, if you request additional technical support, and if your no-charge technical support period has expired, or if you are not eligible for standard no-charge technical support, you may be charged a non-refundable fee.

For more information about eligibility for no-charge technical support, see the following article in the Microsoft Knowledge Base:
Q154871 Determining If You Are Eligible for No-Charge Technical Support

SNA Server 3.0

This feature is available in the latest service pack for SNA Server version 3.0. For additional information, please see the following article in the Microsoft Knowledge Base:
Q184307 How to Obtain the Latest SNA Server Version 3.0 Service Pack

Additional query words: 


Keywords          : 
Version           : WINDOWS:3.0 SP3,4.0 SP2
Platform          : WINDOWS 
Issue type        : kbinfo

Last Reviewed: July 8, 1999