Solution : https://service.sap.com/sap/support/notes/672259 (SAP Service marketplace login required)
Key words : 
<root_dir>\<install-dir>\cluster\server\services\servlet_jsp \wor, >\root\web-inf\lib, symptom logoff functionality, blank screen reason, prerequisites isa application, lib directory, workingblank page, ipc installation, refer note, \jsptemp\<web_app
Related Notes : 
       
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