Host Integration Server allows range of IP ports with distributed link service (224303)

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 SNA Server service (node) issues a Close Link request and 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 registry entry is available 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 Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

1. Start Registry Editor (Regedt32.exe).
2. Locate the following key in the registry:

   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\SnaRemx\Parameters\SnaTCP

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

   Value Name: LocalIPPortRange
   Data Type: REG_DWORD
   Value: 1 (The default value is 1.)

4. Quit Registry Editor.