webMethods Knowlegebase : Intermittent errors in SAP Adapter Listener (1804942)

Problem

Intermittent issues with SAP integrations using SAP Adapter Listeners and Synchronous Notifications.

There are two types of errors, both causing IDoc lost.

1) "connection closed" errors observed intermittently, no error visible in SAP system

Errors in IS log:

-------------------

2020-06-04 06:30:21 CEST [SAP.0104.0005W] Error in RFC Listener xxxx.connectors.yyyyyy.sap:TIMERS_Listener with status "ALIVE" and connection "sapddddd.prg-xxx.com|sapgw00|TIMERSO01": CPIC-CALL: CMSEND on convId: 18834844

no SAP ErrInfo available

2020-06-04 06:30:21 CEST [SAP.0104.0005W] Error in RFC Listener xxxx.connectors.yyyyyy.sap:TIMERS_Listener with status "ALIVE" and connection "sapddddd.prg-xxx.com|sapgw00|TIMERSO01": CPIC-CALL: 'CMSEND';

connection closed

Errors in SAP Adapter trace file:

----------------------------------------

Error: [9] >Thu Jun 04 05:45:15,410< RfcException raised by system [cvcvcvcv3145|WEBM]:

message: CPIC-CALL: SAP_CMACCPTP3 on convId:

LOCATION CPIC (TCP/IP) with Unicode

ERROR SNC required (SNC_MODE=ON defined) for conversation 69394303,

tp = WM_RFC_DP1

TIME Thu Jun 4 05:45:15 2020

RELEASE 721

COMPONENT CPIC (TCP/IP) with Unicode

VERSION 3

RC 767

MODULE r3cpic_mt.c

LINE 14490

COUNTER 6

return code: RFC_FAILURE (1)

error group: 102

key: RFC_ERROR_COMMUNICATION

Error: >Thu Jun 04 06:00:09,735< >RfcIoException:

message: CPIC-CALL: CMSEND on convId: 17869549

no SAP ErrInfo available

Return code: RFCIO_ERROR_SYSERROR (5)<

Error: >Thu Jun 04 06:00:09,746< >RfcIoException:

message: CPIC-CALL: 'CMSEND';

connection closed

Return code: RFCIO_ERROR_SYSERROR (5)<

2) 2nd type of error is about SNC. SNC is enabled and configured on both sides, and previously worked without issues. SAP system sending IDocs is getting error:

SNC disabled for conversation 60499221, tp = WM_RFC

Error in SAP Adapter trace file:

--------------------------------------

Error: [11] >Thu Jun 04 08:16:14,163< ERROR: receiveConversationID: SAP_CMACCPTP3(waitTime=2, niHandle=102) returns: 17 after 0 attempts: RFC handle is [11]

Error: >Thu Jun 04 08:16:14,163< >RfcIoException:

message: CPIC-CALL: SAP_CMACCPTP3 on convId:

LOCATION CPIC (TCP/IP) with Unicode

ERROR SNC required (SNC_MODE=ON defined) for conversation 77802057,

tp = TIMERSO01

TIME Thu Jun 4 08:16:14 2020

RELEASE 721

COMPONENT CPIC (TCP/IP) with Unicode

VERSION 3

RC 767

MODULE r3cpic_mt.c

LINE 14490

COUNTER 3

Return code: RFCIO_ERROR_INTERNAL (3)<