Solution : https://service.sap.com/sap/support/notes/77337 (SAP Service marketplace login required)
Key words : 
job r3rmtdb wait approximately 5 minutes, current ibm info apar, present info apar, local api calls, startup program qstrup, job r3rmtdb, terms r3rmtdb, r3400/r3rmtdb, autostart job, remote connect
Related Notes : 
       
| 576371 | iSeries: CPFB752 "Internal error in API" | 
| 146624 | i5/OS: Database Multiconnect for IBM DB2 for i5/OS | 
| 98222 | AS/400: exit R3RMTDB jobs | 
| 96991 | AS/400: ab_as400api: can't get connection_handle... | 
| 83292 | Releases and PTFs for R/3 on AS/400 | 
| 47712 | AS/400: No socket link via XDA possible | 
| 46519 | AS/400: Missing values on DB02 initial screen |