CPIC Application Stops Responding When Starting Conversation

ID: Q165088

The information in this article applies to:

Microsoft SNA Server, version 3.0

SYMPTOMS

When you run a CPIC application on Windows 95, the CPIC application stops responding intermittently when you try to acquire the conversation. Traces show that the CM_Init request is not getting a response.

CAUSE

This problem occurs if both of the following conditions are true:

The CPIC application calls WinCPICCleanup() while there are pending RPC requests.

-and-

The RPC response arrives before SNAKRNL has closed all connections.

The following is a call to WinAPPCCleanup. Under the covers, there are still outstanding rpc requests:


   APPC   WinAPPCCleanup response, result = TRUE
   CPIC   ---------------------------------------------- 09:34:42.49
   CPIC   WinCPICCleanup response, result = TRUE
   CPIC   ---------------------------------------------- 09:34:42.99
   CPIC   WinCPICStartup request
   CPIC
   CPIC   Version Requested = 1.0
   APPC   ---------------------------------------------- 09:34:42.99
   APPC   WinAPPCStartup request
   APPC
   APPC   Version Requested = 1.0
   APPC   ---------------------------------------------- 09:34:42.99
   APPC   WinAPPCStartup response, result = OK
   APPC
   APPC   Version Supported = 1.0
   CPIC   ---------------------------------------------- 09:34:42.99
   CPIC   WinCPICStartup response, result = OK
   CPIC
   CPIC   Version Supported = 1.0

The following is a request to start the conversation. There is no return to the CMNIT() CPIC call:


   CPIC   ---------------------------------------------- 09:34:43.10
   CPIC   CMINIT request
   CPIC    Sym dest name = QR27
   APPC   ---------------------------------------------- 09:34:43.10
   APPC   TP_STARTED request
   APPC
   APPC   Type:Sync                                  VerbID:00001800
   APPC
   APPC   ---- Verb Parameter Block at address 01300000 ----
   APPC   14000000 00000000 00000000 00000000     <................>
   APPC   00000000 00000000 F80B5800 C3D7C9C3     <........8.X.CPIC>
   APPC   6DC4C5C6 C1D3E36D E3D72020 20202040     <mDEFALTmTP     @>
   APPC   40404040 40404040 40404040 40404040     <@@@@@@@@@@@@@@@@>
   APPC   40404040 40404040 40404040 40404040     <@@@@@@@@@@@@@@@@>
   APPC   40404040 40404040 40404040              <@@@@@@@@@@@@    >

RESOLUTION

To resolve this problem, obtain the hotfix mentioned below. With the hotfix, SNAKRNL now ignores all RPC responses that arrive after WinCPICCleanup() or WinAPPCCleanup().

STATUS

Microsoft has confirmed this to be a problem in SNA Server version 3.0. This problem was corrected in the latest Microsoft SNA Server 3.0 U.S. Service Pack. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Additional query words: prodsna

Keywords : kbnetwork snaappc kbbug3.00 kbfix3.00.sp1
Version : WINDOWS:3.0
Platform : WINDOWS
Issue type : kbbug