Solution : https://service.sap.com/sap/support/notes/1072464 (SAP Service marketplace login required)
Key words : 
registered inbound queues activated, rdisp/wp_no_vb  = 0                     rdisp/wp_no_vb2 = 0 4, i5/os application servers, i5/os database server, i5/os instances, i5/os instance, symptom processes terminate, runtime error dbif_dsql2_connecterr, terms live cache, field 'execution target'
Related Notes : 
       
| 1047374 | IBM i: liveCache access for SCM 4.1 and the following | 
| 1037016 | IBM i: MaxDB Client Support for IBM i application server | 
| 786412 | Determining execution server of jobs w/o target server | 
| 369007 | qRFC: Configuration for the QIN Scheduler |