2112952 - AS Java cannot start due to UMEBackendConnection failure - hostname 'HOSTNAME' unknown

The system cannot start properly and you see the following exception in the trace files:

• dev_serverX:
  [Thr 93] ***LOG Q0I=> NiPConnect: IP_ADDRESS:PORT: connect (239: Connection refused) [/bas/741_REL/src/base/ni/nixxi.cpp 2931]
  [Thr 93] *** ERROR => NiPConnect: SiConnect failed for hdl 25/sock 31
      (SI_ECONN_REFUSE/239; I4; ST; IP_ADDRESS:PORT) [nixxi.cpp    2931]
  ...
  ERROR => Java node 'server0' terminated with exit code 2150
  
  Or for newer systems:
  
  ***LOG Q0I=> NiPGetHostByName: 'HOSTNAME' not found: getaddrinfo [/bas/745_REL/src/base/ni/niuxi.c 1759]
  
  
  
   
• std_serverX:
  com.sap.engine.frame.ServiceException: Start of UME service failed. Check help topic "Start of UME Service Failed". 
  Technical details: com.sap.conn.jco.JCoException: 
  (102) JCO_ERROR_COMMUNICATION: Initialization of destination UMEBackendConnection failed: Connect to SAP gateway failed
  Connection parameters: TYPE=A DEST=UMEBackendConnection ASHOST=HOSTNAME SYSNR=XX PCS=Y
  
  
  In some scenarios, you can see these details:
  
  LOCATION    CPIC (TCP/IP) on local host with Unicode
  ERROR       hostname 'HOSTNAME' unknown
  TIME        Sat Nov 00 00:00:00 0000
  RELEASE     745
  COMPONENT   NI (network interface)
  VERSION     40
  RC          -2
  MODULE      /bas/745_REL/src/base/ni/niuxi.c
  LINE        1759
  DETAIL      NiPGetHostByName: 'HOSTNAME' not found
  SYSTEM CALL getaddrinfo
  COUNTER     2

SAP Netweaver Application Server Java

DNS, resolution problem, not found, not reached, ashost, abap, backend, naming, destination, , KBA , BC-JAS-SEC-UME , User Management Engine , BC-JAS-SF , Startup Framework , Problem