2491196 - LockingManager could not be started - AS Java node terminates with exit code -1501

AS Java fails to start.

You can see in dev_server<x>:

F  ********************************************************************************
F  *** ERROR => Java node 'server0' terminated with exit code -1501.
F  ***
F  *** Please see section 'Java program exit codes'
F  *** in SAP Note 1316652 for additional information and trouble shooting advice.
F  ********************************************************************************
F 
F  [Thr 01] *** LOG => exiting (exitcode -1501, retcode 2).

and in std_server<x>.out:

Loading [LockingManager]...
FATAL: Server process failed to start; manager [LockingManager] could not be started

or:

Loading: LockingManager ... Jun 11, 2017 7:08:22 PM  ...anagerImpl.init(java.util.Properties) [Thread[Thread-1,5,main]] Fatal: Cannot attach to the Enqueue Server Unknown Enqueue Server Host [<hostname>].
Loading: LockingManager returned false!
Kernel not loaded. System halted.

and in defaultTrace_<xx>_<x>.trc:

#Error#com.sap.engine.core.locking.AbstractLockingManagerImpl#
com.sap.ASJ.krn_lck.000002#BC-JAS-COR#kernel.sda#C0000A0AB8AF00010000000200B7009C###com.sap.engine.core.locking.AbstractLockingManagerImpl########Thread[main,5,main]#Plain##
Failed to start Locking Manager. Cluster node cannot be started
com.sap.engine.frame.core.locking.TechnicalLockException: Cannot initialize "EnquLocktableClient".
...
Caused by: java.lang.Exception: class com.sap.bc.krn.enqu.EnquCommException reported: EnccliMultiplexHandle.constructor: connection 1: connect to enqueue server failed (STATE_ESTABLISHED) 0 times --> Check the status of the enqueue server -1

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AS Java all versions.

SAP NetWeaver 2004 ; SAP NetWeaver 7.0 ; SAP NetWeaver 7.1 ; SAP NetWeaver 7.2 ; SAP NetWeaver 7.3 ; SAP NetWeaver 7.4 ; SAP NetWeaver 7.5 ; SAP enhancement package 1 for SAP NetWeaver 7.0 ; SAP enhancement package 1 for SAP NetWeaver 7.3 ; SAP enhancement package 2 for SAP NetWeaver 7.0 ; SAP enhancement package 3 for SAP NetWeaver 7.0

AS Java, Exit code 1501, Config Tool, Locking Manager, LockingManager, port, host, hostname, Server process failed to start, TechnicalLockException, Enqueue Server, enq, enqueue, enq server, enqserver, enqueueserver, enqu.host, enqu.port, EnquLocktableClient, EnquCommException, Unknown Enqueue Server Host, managers , KBA , BC-JAS-COR , Enterprise Runtime, Core J2EE Framework , BC-JAS-SF , Startup Framework , BC-CST-EQ , Enqueue , Problem