2048771 - MainfameConnect CICS runtime module SYGWCICS abends with RLED abend code

As MainframeConnect (MFC) gatewayLESS client connection and transaction volume increase, ESDA storage demands in CICS are increased as well.

The newer MainframeConnect CICS v15.0 (SP06 & SP07) has been rearchitected to make use of a more efficient socket handler (SYBSOCKH) for gatewayLESS client connections.   This enhancement has also introduced a more memory intensive TCP Listener interface which requires ESDA storage to be properly tuned,  otherwise ESDA storage may be exhausted resulting in gatewayLESS connection failures followed by  RLED abends.

Although this is NOT considered to be a MainframeConnect (MFC) product defect,  the problematic behavior is specific to MainframeConnect (MFC) gatewayless connections only for v15.0 SP06 and SP07.  Gateway enabled environments and MainframeConnect environments running v15.0 ESD05 or earlier are not effected by this.

When there is an ESDA storage shortage you'll see the following following errors reported in the CICS MSGUSR log

 Error occured in TAKESOC2 socket call. Processing terminated                       
 Error occured in TAKESOC2 socket call. Processing terminated                      
 Failed in function TDACCEPT ;RC= -00004993                                          
 Failed in function TDACCEPT ;RC= -00004993                                           
 Failed in function TDACCEPT ;RC= -00004993                                          
 Failed in function TDACCEPT ;RC= -00004993                                           
 Failed in function TDACCEPT ;RC= -00004993                                           
     
  
And shortly thereafter you will observe a CICS transaction dump report an RLED abend

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* IBM Fault Analyzer for z/OS V11R1M0 (UK95249 2013/06/18)                     *
*                                                                              *
*     Copyright IBM Corp. 2000, 2013.  All rights reserved.                    *
******************************************************************************** 
 
TRANID: ESK1      CICS ABEND: RLED                MVSB      2014/07/25  15:12:20 

NOTE: This report was saved after reanalysis of the current fault entry--it was
      not generated during real-time processing. 
 
- <H1> I B M   F A U L T   A N A L Y Z E R   S Y N O P S I S 
  
A CICS abend RLED occurred in module SYGWCICS CSECT TDCOMSTG at offset X'13E'.
 
The abend occurred after executing machine instruction 0DEF (BRANCH AND SAVE).
 
NOTE: Source code information for CSECT TDCOMSTG could not be presented because
      no compiler listing or side-file data sets were provided.

• MainfameConnect Server and DB2 Options for CICS v15.0 SP07 TCPIP gatewayless with 10 TCPIP listeners configured in CICS
• jConnect: jConnect (TM) for JDBC(TM)/6.05(Build 26564)/P/EBF16903/JDK14/Sun May 31  1:05:35 200
• Client application is Apache J-meter configured with the SAP (old Sybase) jConnect JDBC driver
• z/OS 1.13
• CICS TS 5.1
• DB2 10.1

OSC
OCC
AMD2
MVS
z/OS
DB2
DC
TRS
TRSLU62
TRSTCP
DB2AS
DB2 Access Service
DirectConnect
DCA
ECDA
EnterpriseConnect Data Access , KBA , BC-SYB-MFC , Mainframe Connect (MFC) , Problem