Solution : https://service.sap.com/sap/support/notes/1533608 (SAP Service marketplace login required)
Key words : 
gateway>rrmx_fe_service    33<system number>rrmx_be_host       <ip adress, gateway>rrmx_be_service    33<system number>rrmx_pass_socket    xissue 3, activate profile parameters login/accept_sso2_ticket, parameter          valuerrmx_fe_host       <ip adress, terms bex browser, prerequisites - solution issue 1, invalid win 32 application, abap dump raise_exception, symptom collective note, apply note 1471630issue 5
Related Notes : 
       
| 1508080 | RRMX Support for SAP Router Strings | 
| 1498947 | RRMX: Logon mechanism for 720 GUI. | 
| 1490558 | RRMX:Launching reports present in another system | 
| 1477686 | Business Explorer: duplicate usage of file extension ".bex" | 
| 1471630 | BExAnalyzer: connection problems with RRMX and SAP Gui 7.20 | 
| 1443825 | BExAnalyzer: save popup appears when started via RRMX | 
| 1435326 | Usage of transaction RRMX / precalc server with SAP Gui 7.20 |