Solution : https://service.sap.com/sap/support/notes/1432796 (SAP Service marketplace login required)
Key words : 
involved business connector servers, -logon cycle business connector 4, business connector servers, session id cookie, www-authenticate response, session overview ui, reverse invoke configuration, core fixes mentioned, sap business connector, logon cycle
Related Notes : 
       
| 1260891 | Business Connector 4.8 Core Fix 4 | 
| 657153 | Business Connector 4.7 Core Fix 10 |