> I've already post this message in the past and I try
   > again if one of you can help me.
   >
   > _XSERVTransSocketOpenCOTSServer: Unable to open socket
   > for inet6
   > _XSERVTransOpen: transport open failed for
   > inet6/station-1.ganimede.it:0
   > _XSERVTransMakeAllCOTSServerListeners: failed to open
   > listener for inet6
   > Could not init font path element
   > /usr/X11R6/lib/X11/fonts/Type1/, removing from list!
   > Could not init font path element
   > /usr/X11R6/lib/X11/fonts/CID/, removing from list!
   >
   >
   > I see this message when X start. How ca I disable IPV6
   > in X startup (I removed IPV6 support from Kernel)?
   
   I don't think you can. But since this doesn't do any harm why bother?

try "X -nolisten inet6"