Solution : https://service.sap.com/sap/support/notes/1565553 (SAP Service marketplace login required)
Key words : 
topics                                          date changed======                                          ============1 general information                              dec/20082 pre-installation                                oct/20053 installation                                    jun/20104 post-installation                                oct/20115 troubleshooting                                  mar/2009   sap netweaver 7, /partnerworld/pub/porting/tools/atk/vnc, 24/jun/08 > ---------------------------------additonal application server installation, dec/08>--------------------------virtual network computing, general information +===================================================================+------------------<c5038284, pre-installation +===================================================================+------------------<c5038284, post-installation+===================================================================+------------------------- <d031385, existing sap systems installed, vnc'qaptl/vncpasswd usehome, fkd-00049  xml parser error
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