SNA Server Does Not Resource Locate to Active APPC Connection

• Microsoft SNA Server, versions 2.0, 2.1, 2.11
  on the following platforms: NT

SYMPTOMS

The SNA Server WinAPPC engine may display "Primary rc=0003 Secondary rc=00000004" or "Primary rc=0003 00000005" when trying to connect to an SNA Server domain with the following configuration:

• Two or more SNA Servers that have peer connections to the same host resource (same remote LU name), and have Local LUs that are each a "Member of the default outgoing local appc LU pool". One of the SNA server's connections is active and the other server's connection is inactive or pending.
  
  If it is inactive, then "Primary rc=0003 Secondary rc=00000004" is displayed; if it is pending, then "Primary rc=0003 00000005" is displayed.



• The client that is attempting to connect to this domain, specifies only the Remote LU and lets the SNA Server domain resource locate to the appropriate SNA Server.

CAUSE

An SNA Server client creates a service table by first contacting the SNA Server domain. The service table is comprised of all available SNA Servers in the domain that can service requests from SNA Server applications. The SNA Server client tries each SNA Server in the service table in numeric order until it finds one SNA Server that can satisfy the client's request (using the Remote LU specified by the client application). Because the service table list is generated randomly, the available SNA Servers can end up in any order numerically. SNA Server uses the second entry it finds in the list when it attempts to allocate an APPC conversation.

Therefore, in the failing case, the SNA Server with the active connection must be first in the service table, and the SNA Server with the inactive connection will end up further down the list. When the client fails on the second inactive connection, SNA Server doesn't resource locate to any other servers in the service table.

STATUS

Microsoft has confirmed this to be a problem in SNA Server 2.1. This problem was corrected in SNA Server version 2.11.

Additional query words: prodsna 2.00 2.10 2.11

Keywords :
Version : WINDOWS:2.0,2.1,2.11
Platform : WINDOWS
Issue type :