3780693 - Error in phase MAIN_SWITCH/STARTSAP_TRANS: Another application is listening on this port or another instance of the enqueue server is already running

• An error occurs during the SUM Execution phase MAIN_SWITCH/STARTSAP_TRANS.

Last error code set:
Process <Driver>:\usr\sap\SID\DVEBMGS00\exe/sapcontrol.exe exited with 2, see
'<Driver>:\work\SUM\abap\log\SAPup.ECO' for details
System start failed

• SAPup.ECO shows EnqueueServer status is GREY:

EXECUTING <Driver>:\usr\sap\SID\DVEBMGS00\exe\sapcontrol.exe -format script -prot PIPE -host <Hostname> -nr 00 -function GetProcessList

07.07.2026 10:20:05
GetProcessList
OK
0 name: msg_server.EXE
0 description: MessageServer
0 dispstatus: GREEN
0 textstatus: Running
0 starttime: 2026 07 07 10:19:46
0 elapsedtime: 0:00:19
0 pid: 18532
1 name: enserver.EXE
1 description: EnqueueServer
1 dispstatus: GRAY
1 textstatus: Stopped
1 starttime: 2026 07 07 10:19:46
1 elapsedtime: 0:00:00
1 pid: -1
2 name: disp+work.EXE
2 description: Dispatcher
2 dispstatus: GREEN
2 textstatus: Running, Message Server connection ok, Dialog Queue time: 0.00 sec
2 starttime: 2026 07 07 10:19:46
2 elapsedtime: 0:00:19
2 pid: 17200

• \DVEBMGS00\work\dev_enqsrv_new shows below error: 

[Thr 10520] *** ERROR => Listen failed on port/service 50019 [enservglob.c 1671]
[Thr 10520] *** ERROR => Another application is listening on this port or another instance of the enqueue server is already running. I exit now. [enservglob.c 1672]

• SAP system based on AS ABAP

System start failed, MAIN_SWITCH/STARTSAP_TRANS, EnqueueServer, grey, SAPup.ECO, dev_enqsrv_new, Listen failed on port/service 50019, Another application is listening on this port or another instance of the enqueue server is already running , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem