Solution : https://service.sap.com/sap/support/notes/928952 (SAP Service marketplace login required)
Key words : 
0 including enhancement package 1 sr1 installation guide - web dispatcher, 0 including enhancement package 2 installation guide - web dispatcher, sap business suite 7i 2011 systems, symptom                 web dispatcher installation                 based, installation guide - web dispatcher, 0 installation guide - web dispatcher, sap business suite 7i 2011, ehp1 sr1 sap note 1341276, ehp1 sr1 sap note 1387319, 0 including enhancement package 3
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