2173204 - LB: Hostname or service of the message server unknown

Symptom

When an RFC connection uses Message Server with load balancing enabled, the following error is raised in the corresponding RFC-trace file (dev_rfc*) in the work directory (/usr/sap/<SYS>/<instance name>/work):

Error RFCIO_ERROR_SYSERROR in abrfcpic.c : 2827
LB: Hostname or service of the message server unknown
DEST =XXXXX
MSHOST =XXXXXXXX
R3NAME =XXX
GROUP =XXX
ABAP Programm: xxxxxx (Transaction: )
User: XXXXX (Client: 001)
Destination: XXXXX (Handle: 2, DtConId: 00000000000000000000000000000000, DtConCnt: 0, ConvId: ,)
EPP RootContextId: XXX568D6568XXXXX187DCD15XXXXX09, ConnectionId: 00000000000000000000000000000000, ConnectionCnt: 0
EPP TransactionId: 2B3FXXXXX1B2F1D78C09005056XXXXX

Environment

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

Product

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

Keywords

Error when opening an RFC connection, LB: Hostname or service of the message server unknown, service '?' unknown, Service sapms<sid> unknown, SM59, /etc/services, %windir%\System32\drivers\etc\services, dev_rfc, /usr/sap/<SYS>/<instance name>/work, Connection Test, SAPOSS, SAP-OSS , KBA , BC-CST-LG , Logon group based load balancing , BC-MID-RFC , RFC , Problem

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