The following events are logged in the Windows NT Application Event Log on the SNA Server:
Event ID: 60
Source: SNA Server
Description: Failed to invoke APPC TP 06F2 (), local LU = <Local APPC LU>, Sense Data = 84c0000
Event ID: 730
Source: SNA Server
Description: The SNA Server was unable to locate an invokable TP UN2, APPC LU Alias <Local APPC LU>, Workstation name: <SNA Server Name>.
If Event 60 is occurring for an advanced program-to-program communications (APPC) transaction program (TP) name other than 06F2 (UN2), then this article does not apply to the problem.
If an SNA Server local APPC Logical Unit (LU)
SyncPoint Support checkbox is selected, SNA Server indicates support for SyncPoint in its BIND request when it establishes an LU6.2 session with the host subsystem. The subsystem (such as the Customer Information Control System [CICS]) may detect this support and initiate an attach request to start a conversation with the SNA Server Resynchronization transaction program (TP) in order to perform an Exchange Log Names request, which is required for SyncPoint-enabled LUs. However, if the COM Transaction Integrator (COMTI) has not been installed with SNA Server, this TP will not exist and the host request will be rejected.
Install COMTI to provide SyncPoint support, or if SyncPoint support has been enabled in error, then disable SyncPoint support on the local APPC LUs.
To disable SyncPoint support, open
Properties for the local LU specified in the events, and go to the
Advanced tab. Under
SyncPoint Support, clear
Enable, save the configuration, and then stop and restart the SNA Server Service.
The SyncPoint function allows all TPs that are processing a distributed transaction to coordinate error recovery and maintain consistency among distributed resources, such as databases.
The SyncPoint function affects protected resources. These include conversation resources and implementation or installation-designated
resources, such as databases. Any changes to a protected resource are
logged so that they can be either backed out (reversed) if the transaction
detects an error, or committed (made permanent) if the transaction is
successful.
In order for a protected conversation to be allocated, both LUs must support the IBM Sync Level 2 protocol. The two LUs exchange their synchronization support levels in byte 24 of the BIND. The negotiation of support is handled by the Exchange Log Name (X'1211') General Data Stream (GDS) variable. The resync service implements the "Exchange Log Names" function of an SNA transaction manager.
COMTI provides a resynchronization service (SNA LU 6.2 Resync TP). This Windows NT service is configured to be the auto-started invokable service for the SNA-defined Resync TP (0x06F2).
All of COMTI's resync and 2PC flows are implemented in conformance with the SNA Sync Point Services Architecture Reference (IBM SC31-8134-00).
SNA SyncPoint Services Architecture Reference (IBM SC31-8134-00), SNA Formats (GA27-3136-14)