Solution : https://service.sap.com/sap/support/notes/1440345 (SAP Service marketplace login required)
Key words : 
symptom load balancer reveals backend server information, server instance ids, server instance, session information, restrict information, netweaver versions 7, solution installation, patch levels, information, prerequisites
Related Notes : 
       
| 1495500 | |
| 888889 | Automatic checks for security notes using RSECNOTE |