How To Stop SNA Server From Retrying BIND Attempts (250145)

SUMMARY

In some cases, you may want to stop SNA Server from retrying BIND attempts when an APPC or CPI-C application is attempting to establish a conversation.

One instance where it might be useful to stop the BIND retries is if APPC or CPI-C sessions are configured on the SNA Server to connect to a CICS region on the mainframe, and the CICS region is down. By default, the SNA Server tries to reestablish the sessions until the region is available. This behavior can cause unwanted network traffic and can cause the Event Log on the server to fill up with Event 18 messages reporting failed BIND attempts. NOTE: SNA Server 4.0 and later will not log multiple Event 18 messages for each failed BIND attempt on the same LU/LU/Mode triplet.

MORE INFORMATION

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:

256986 Description of the Microsoft Windows Registry

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.

To stop continuous BIND retries, add the following registry entry to the SNA Server:

Start Registry Editor (Regedt32.exe).

Locate the following key in the registry:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SnaServr\Parameters

On the Edit menu, click Add Value, and then add the following registry values:

   Value Name: BINDRETRY
   Data Type:  REG_DWORD
   Value:      0

Quit Registry Editor and restart the Snaservr service to activate the changes.

With this registry change SNA Server sends a BIND request when an APPC or CPIC application sends [MC]ALLOCATE or CMALLC, but it will not retry if the BIND attempt fails.