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2547393 - Error message XS816 'Connection refused' for SMTP messages in SOST


  • You are attempting to send messages using the STMP protocol from the SAP system.
  • These messages are failing with error message XS816 - Message cannot be transferred to node SMTP due to connection error (final).
  • The long text of the error message shows: Information from external system (if available) Connection refused


    XS816 1.png



  • SAP NetWeaver
  • Release independent


SMTP SmtpPlugInGetErrorText: Connection refused(-41), close connection, N.C421.MConnection refused, NIECONN_REFUSED(-10), NIEHOST_UNKNOWN(-2), SMTP, Connection request to partner failed(-20)
, KBA , BC-SRV-COM , Communication Services: Mail, Fax, SMS, Telephony , Problem

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