Edit File: vnc-server.xml
<?xml version="1.0" encoding="utf-8"?> <service> <short>Virtual Network Computing Server (VNC)</short> <description>A VNC server provides an external accessible X session. Enable this option if you plan to provide a VNC server with direct access. The access will be possible for displays :0 to :3. If you plan to provide access with SSH, do not open this option and use the via option of the VNC viewer.</description> <port protocol="tcp" port="5900-5903"/> </service>