2430115 - ICM_HTTP_CONNECTION_FAILED when testing RFC destination - NIEHOST_UNKNOWN

Symptom

A connection test is failing to an RFC destination of type G (HTTP Connections to External Server) or H (HTTP Connections to ABAP System) in transaction SM59.
At the bottom of the screen, the error ICM_HTTP_CONNECTION_FAILED appears.
Another scenario is SAP Web Dispatcher couldn't connect with backend system, "503 Service Not Available" occurs when calling SAP Web Dispatcher URL.

Environment

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

Product

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

Keywords

ping, network, resolution, hostname, connectivity, connection, broken, NIECONN_BROKEN, RFC destination, SM59, connection test, ICM_HTTP_CONNECTION_FAILED, dev_icm, Connection request from (98/2174/0) to host: <target_hostname>, service: <target_service> failed (NIEHOST_UNKNOWN), IP address, /etc/hosts, DNS, target IP, destination, gateway, hostname buffer, SMGW, Invalidate Buffer,503 Service Not Available , KBA , BC-CST-IC , Internet Communication Manager , BC-CST-GW , Gateway/CPIC , Problem

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