Hi,

I have virtualbox-ose-4.1.14 and libvncserver-0.9.9 installed on FreeBSD 9
and while I could start one VM using VBoxHeadless fine, the 2nd one would
start but if I tried to attach to the VNC server it would crash with a bus
error.  The only thing I noticed in the startup messages was

12/05/2012 19:01:24 Listening for VNC connections on TCP port 5901
12/05/2012 19:01:24 rfbListenOnTCP6Port: error in bind IPv6 socket: Address 
already in use

I tracked this down to libvncserver having IPv6 support but virtualbox
not setting the IPv6 port, just the IPv4 port.  I recompiled with debugging
symbols and the attached patch and the crashes have stopped.  I'm
inclined to suspect that the patch stops the crash.  I'm half pondering
altering the patch a little so that if a port isn't specified it uses the
autoprobe feature of libvncserver to find a free port rather than blindly
assuming 5900 all the time.

Regards,

Gary
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