starting with a precise 64-bit server install, I configured the following;

sudo apt-get install lightdm x11vnc

sudo dpkg-reconfigure lightdm

in /etc/init/x11vnc.conf, I placed;

start on login-session-start

script

/usr/bin/x11vnc -xkb -auth /var/run/lightdm/root/:0 -noxrecord -noxfixes -noxdamage -forever -bg -rfbport 5900 -o /var/log/x11vnc.log

end script

Using UltraVNC from windows, I connect and enter valid login information, and the window immediately closes. The vnc log shows;

30/04/2013 16:52:01 Got connection from client 10.0.2.2

30/04/2013 16:52:01   other clients:

30/04/2013 16:52:01 Disabled X server key autorepeat.

30/04/2013 16:52:01   to force back on run: 'xset r on' (3 times)

30/04/2013 16:52:01 incr accepted_client=1 for 10.0.2.2:61281  sock=8

30/04/2013 16:52:01 Client Protocol Version 3.8

30/04/2013 16:52:01 Protocol version sent 3.8, using 3.8

30/04/2013 16:52:01 rfbProcessClientSecurityType: executing handler for type 1

30/04/2013 16:52:01 rfbProcessClientSecurityType: returning securityResult for client rfb version >= 3.8

30/04/2013 16:52:01 copy_tiles: allocating first_line at size 33

30/04/2013 16:52:02 Pixel format for client 10.0.2.2:

30/04/2013 16:52:02   32 bpp, depth 24, little endian

30/04/2013 16:52:02   true colour: max r 255 g 255 b 255, shift r 16 g 8 b 0

30/04/2013 16:52:02 no translation needed

30/04/2013 16:52:02 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0x0000000A)

30/04/2013 16:52:02 rfbProcessClientNormalMessage: ignoring unsupported encoding type zlibhex

30/04/2013 16:52:02 Using compression level 6 for client 10.0.2.2

30/04/2013 16:52:02 Enabling X-style cursor updates for client 10.0.2.2

30/04/2013 16:52:02 Enabling full-color cursor updates for client 10.0.2.2

30/04/2013 16:52:02 Enabling cursor position updates for client 10.0.2.2

30/04/2013 16:52:02 Using image quality level 6 for client 10.0.2.2

30/04/2013 16:52:02 rfbProcessClientNormalMessage: ignoring unsupported encoding type xorEnable

30/04/2013 16:52:02 Enabling LastRect protocol extension for client 10.0.2.2

30/04/2013 16:52:02 Enabling NewFBSize protocol extension for client 10.0.2.2

30/04/2013 16:52:02 rfbProcessClientNormalMessage: ignoring unsupported encoding type cacheEnable

30/04/2013 16:52:02 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8000)

30/04/2013 16:52:02 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8001)

30/04/2013 16:52:02 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8002)

30/04/2013 16:52:02 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8003)

30/04/2013 16:52:02 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xC0A1E5CE)

30/04/2013 16:52:02 Using ZRLE encoding for client 10.0.2.2

30/04/2013 16:52:03 Pixel format for client 10.0.2.2:

30/04/2013 16:52:03   32 bpp, depth 24, little endian

30/04/2013 16:52:03   true colour: max r 255 g 255 b 255, shift r 16 g 8 b 0

30/04/2013 16:52:03 no translation needed

30/04/2013 16:52:03 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0x0000000A)

30/04/2013 16:52:03 rfbProcessClientNormalMessage: ignoring unsupported encoding type zlibhex

30/04/2013 16:52:03 Using compression level 6 for client 10.0.2.2

30/04/2013 16:52:03 Enabling X-style cursor updates for client 10.0.2.2

30/04/2013 16:52:03 Enabling full-color cursor updates for client 10.0.2.2

30/04/2013 16:52:03 Enabling cursor position updates for client 10.0.2.2

30/04/2013 16:52:03 Using image quality level 6 for client 10.0.2.2

30/04/2013 16:52:03 rfbProcessClientNormalMessage: ignoring unsupported encoding type xorEnable

30/04/2013 16:52:03 Enabling LastRect protocol extension for client 10.0.2.2

30/04/2013 16:52:03 Enabling NewFBSize protocol extension for client 10.0.2.2

30/04/2013 16:52:03 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8000)

30/04/2013 16:52:03 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8001)

30/04/2013 16:52:03 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8002)

30/04/2013 16:52:03 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8003)

30/04/2013 16:52:03 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xC0A1E5CE)

30/04/2013 16:52:03 Switching from ZRLE to hextile Encoding for client 10.0.2.2

30/04/2013 16:52:03 client_set_net: 10.0.2.2  0.0015

caught XIO error:

30/04/2013 16:52:07 deleted 32 tile_row polling images.

tail: x11vnc.log: file truncated

30/04/2013 16:52:08 passing arg to libvncserver: -rfbport

30/04/2013 16:52:08 passing arg to libvncserver: 5900

Any ideas what I'm missing?