IT41772: THE MQ LISTENER PROCESS TERMINATES DUE TO A TCP RESET WHILE ESTABLISHING AN INCOMING NETWORK CONNECTION.

APAR status

• Closed as program error.

Error description

• The MQ listener process terminates. The executable runmqlsr
  disappears from the list of running processes.
  
  These messages show up in EMS:
  
  MQ message: AMQ9219: The TCP/IP listener program could not
  create a new connection for the incoming conversation.
  EXPLANATION : An attempt was made to create a new socket
  because an attach request was received, but an error occurred.
  ACTION : The failure may be transitory, try again later.
  If the problem persists, record the return code 4120 and tell
  the systems administrator. It may be necessary to free some jobs
  or restart the communications system.
  
  MQ message: AMQ5027: The listener 'LISTENER' has ended.
  ProcessId(4,2206 ¢X1TR 1442846886).
  EXPLANATION : The listener process has ended. ACTION : None.
  
  You may find following FDC on your system if the listener
  termination has been caused by a port scanner:
  
  | Probe Id          :- CO618000
  | Component         :- cciInvalidDataReceived
  | Program Name      :- amqrmppa
  | Thread            :- 9    RemoteResponder
  | Major Errorcode   :- rrcE_BAD_DATA_RECEIVED
  | Minor Errorcode   :- OK
  | Probe Type        :- MSGAMQ9207
  | Probe Severity    :- 2
  | Probe Description :- AMQ9207: The data received from host
  | 'XX.XXX.XXX.XXX' on channel '????' is not valid.
  | FDCSequenceNumber :- 0
  | Comment1          :- XX.XXX.XXX.XXX (IP address)
  | Comment2          :- TCP/IP
  
  MQM Function Stack
  ccxResponder
  rrxResponder
  rriAcceptSess
  ccxReceive
  cciTcpReceive
  cciInvalidDataReceived
  xcsFFST
  

Local fix

• The customer needs to restart the listener.
  The customer could check if he used a port scanner for security
  tests. The port scanner could have caused the connection reset.
  

Problem summary

• The connection reset condition (ECONNRESET error) is unhandled
  in the MQ listener code.
  The listener runs the default handling which is error reporting
  (FDC, EMS) and termination.
  

Problem conclusion

• An error handling (network socket recreate) has been implemented
  for error condition ECONNRESET with listen() and accept().
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v8.1       8.1.0.11
  The latest available maintenance can be obtained from
  'Recommended Fixes for IBM MQ'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  If the maintenance level is not yet available information on
  its planned availability can be found in 'IBM MQ planned
  maintenance release dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

Temporary fix

• The only known root cause for this problem are port scanner
  tests. The customer should be aware that listener processes
  may terminate due to these tests.
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  MQ FOR HPE NS O

• Fixed component ID

  5724A3904

Applicable component levels