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1974139 - Message server disconnection error while system works fine


After system upgrade, for example Unicode conversation or applying a newer Support Package (SP), the below error appears in the Dispatcher trace file (/usr/sap/<SYS>/<instance name>/work/dev_disp):

*** ERROR => DpMsgProcess: MsReceive () -> MSEPARTNERUNKNOWN, partner: -

And in the Message Server trace file (/usr/sap/<SYS>/<instance name>/work/dev_ms), the following can be seen during the same timestamp:

*** ERROR => MsSClientHandle: C1 (xxx_<SID>_<NR>) send inv_name xxx_<SID>_<NR> [msxxserv.c   6184]
  • Where C1 (xxx_<SID>_<NR>) is the real existed instance which reporting the above error in the dev_disp trace,
  • inv_name xxx_<SID>_<NR> is the source system,
  • The error does not have any application impacts, the system is working fine and connection between the message server and the dialog instance is also fine,
  • All instances in the transaction SM51 are active, though the above error happens every time after starting the system.



  • Operating System independent
  • Database independent
  • SAP NetWeaver
  • SAP Web Application Server for SAP S/4HANA
  • ABAP Platform


ABAP platform all versions ; SAP NetWeaver all versions ; SAP Web Application Server for SAP S/4HANA all versions


RZ04, MSEPARTNERUNKNOWN, send inv_name, system upgrade, Unicode conversation, Support Package (SP), /usr/sap/<SYS>/<instance name>/work/dev_disp, Message Server, /usr/sap/<SYS>/<instance name>/work/dev_ms, SM51, RZ04, operation mode switch, old instance, RZ12, RFC logon group, INSTANZNAME , KBA , BC-CST-MS , Message Service , Problem

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