I found that the problem only happens when using option "-depth" bigger than 8. The default is 24, so, that is why the problem shows up.
Take a look at this log: # Xvnc :8 -desktop 'X' -auth /root/.Xauthority -geometry 1024x768 -depth 16 Freeing 0 06/05/15 15:23:34 Xvnc version TightVNC-1.3.9 06/05/15 15:23:34 Copyright (C) 2000-2007 TightVNC Group 06/05/15 15:23:34 Copyright (C) 1999 AT&T Laboratories Cambridge 06/05/15 15:23:34 All Rights Reserved. 06/05/15 15:23:34 See http://www.tightvnc.com/ for information on TightVNC 06/05/15 15:23:34 Desktop name 'X' (debian:8) 06/05/15 15:23:34 Protocol versions supported: 3.3, 3.7, 3.8, 3.7t, 3.8t 06/05/15 15:23:34 Listening for VNC connections on TCP port 5908 Font directory '/usr/share/fonts/X11/Speedo/' not found - ignoring *** Error in `Xserver/Xvnc': free(): invalid next size (fast): 0x000001000c52a740 *** Aborted # if I change to 8, I don't see any problem. Xvnc :8 -desktop 'X' -auth /root/.Xauthority -geometry 1024x768 -depth 8 Freeing 0 06/05/15 15:23:39 Xvnc version TightVNC-1.3.9 06/05/15 15:23:39 Copyright (C) 2000-2007 TightVNC Group 06/05/15 15:23:39 Copyright (C) 1999 AT&T Laboratories Cambridge 06/05/15 15:23:39 All Rights Reserved. 06/05/15 15:23:39 See http://www.tightvnc.com/ for information on TightVNC 06/05/15 15:23:39 Desktop name 'X' (debian:8) 06/05/15 15:23:39 Protocol versions supported: 3.3, 3.7, 3.8, 3.7t, 3.8t 06/05/15 15:23:39 Listening for VNC connections on TCP port 5908 Font directory '/usr/share/fonts/X11/Speedo/' not found - ignoring ..... -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]

