Solution : https://service.sap.com/sap/support/notes/645923 (SAP Service marketplace login required)
Key words : 
anadditional page opens providing system information, additional request parameter appinfo=true whenstarting, download trace files usinga web browserthis, turns single activity traceon/offxcmadmin, turns sap java connector page, turns system-cache page, turns catalog-cache page, turns post installation page, single session trace form, parenthesis turn specific tests
Related Notes : 
       
| 646140 | Security Check of Internet Sales | 
| 502803 | Administration area is password protected |