2490626 - "There are no resources to handle the request." - SUM upgrade hangs

During an upgrade using the SUM tool, the deployment hangs although there are no relevant error entries in SUM traces.

The files DEPLOYMENT_RESULTS_XX.LOG show normal state:

Jun 15, 2017 3:10:23 AM [Info  ]: Connecting to Deploy Controller on host <hostname> port 5XXXX with user J2EE_ADMIN.
Jun 15, 2017 3:10:23 AM [Info  ]: Connect to DeployCOntroller using P4 connection

Only one relevant Warning entry is logged in default trace shortly after the timestamp:

#2.0#2017 06 15 03:10:24:021#+0200#Warning#com.sap.engine.services.rmi_p4.server#
com.sap.ASJ.rmip4.rt0007#BC-JAS-COR-RMT#p4#C0000A36526701C10000000100005675#731599050000000001##com.sap.engine.services.rmi_p4.server#J2EE_GUEST#0##68D2952F516711E7A76C00002B9B50CA#68d2952f516711e7a76c00002b9b50ca##0#Thread[RMI/IIOP Worker [2],5,Dedicated_Application_Thread]#Plain##
Processing RMI-P4 request failed. There are no resources to handle the request. This may happen when the load is too big. Increase the P4 request queue size or number of concurrent threads#

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AS Java All versions

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

P4, Deployment, deploy, upgrade, SUM, DEPLOYMENT_RESULTS, DEPLOY-MODEL, defaulttrace, RMI-P4 request failed, queue size, ParallelRequests, requestQueueSize, configtool, no relevant logs, no logs, SOLMAN, hangs, hanging, deployment hanging, deployment hangs, upgrade hangs, upgrade hanging, deploy EDEN Model, RMI , KBA , BC-JAS-COR-RMT , RMI, P4, CORBA, IIOP , BC-JAS-COR , Enterprise Runtime, Core J2EE Framework , BC-UPG-TLS-TLJ , Upgrade tools for Java , BC-JAS-DPL , Deployment , Problem