3062517 - Error "HTTP Code 502 : Host not found" in step Define HTTP Connectivity in SAP Solution Manager 7.2

The following error occurs when testing connectivity for SAP Solution Manager ABAP & JAVA access:

ICM for intern. Web Serv. access: logical port check failed - CO_DIAG_WILY_WS_MANAGED_SETUP using http://<hostname>:<port>
SOAP:1007 SRT: Unsupported xstream found: ("HTTP Code 502 : Host not found")
ICM for External Access: URL http://<hostname>:<port> cannot be reached; see SAP Note 1822831
ABAP server not reached by http at http://<hostname>:<port>/sap/public; (Host not found(502)) see SAP Note 1822831
ABAP server not reached by http at http://<hostname>:<port>/sap/public; (Host not found(502)) see SAP Note 1822831

SAP Solution Manager 7.2

Test Connectivity, Proxy, Local Server , KBA , SV-SMG-INS-CFG , Setup and Configuration of the Solution Manager system , Problem