HELP: VNC Tunnel via OpenSSH

[m0lecule]

Detailed Description: Tunnelling VNC through OpenSSH in Kali Linux 2.1.2 on Raspberry Pi 2
Error I'm Receiving: "Error: Can't open display:"

Thorough Background Info:

I'm trying to get VNC to tunnel through SSH so my VNC communications are encrypted. I'm doing this on my home network via wireless for the time being. I followed some instructions here http://www.penguintutor.com/linux/tightvnc. Unfortunately I can't get VNC to tunnel through SSH despite spending quite a number of hours on it.

My Raspberry Pi 2 is running the newest image of Kali Linux made specifically for the Pi 2 (version 2.1.2 from kali.org).

Here is what I did:
Installed OpenSSH server: made new SSH keys to replace the defaults (protection against MITM), changed the default port.
Installed vncserver:
Started both services on the Pi 2 and confirmed they were working/listening with the commands "chkconfig -l" and "netstat -plant".
Successfully Connected to my Pi 2 via SSH with the command "ssh username@ip-address -p new_port# -L 5901:localhost:5901"
Ran xtightvncviewer 127.0.0.1:1
Received the error message "Error: Can't open display:"

I tried connecting to the Pi from a Windows 7 machine via Putty (made sure to add the tunneling info), and a Linuxbox (with the xtightvncviewer command specified above)

Not sure what to do now. I figured the X stytem is different in Kali from what is in VNC's settings, so I tried changing the /etc/X11 line in my /.vnc/xstartup file to this -> exec
ck-launch-session startxfce4 but, unfortunately I still get "Error: Can't open display:".


Any help would be greatly, greatly
appreciated.

[jnpa]

what's your xstartup file full content? mine is just

#!/bin/bash
startxfce4 &

and is working fine

[m0lecule]

#!/bin/sh

xrdb $HOME/.Xresources
xsetroot -solid grey
#fix to make GNOME work
export XKL_XMODMAP_DISABLE=1
#/etc/X11/Xsession #Ths starts the X11 Window manager
exec ck-launch-session startxfce4

[m0lecule]

what's your xstartup file full content? mine is just

#!/bin/bash
startxfce4 &

and is working fine

i also just tried using your xstartup settings, but that didn't help

[m0lecule]

what's your xstartup file full content? mine is just

#!/bin/bash
startxfce4 &

and is working fine

I'm properly connecting to the VNC via SSH tunnel now. Realized what the issue was: I was running the vnc viewer inside of the ssh connection (on the server - raspberry pi, from the various PC's in my network).

My issue now is the dreaded grey screen in the VNC viewer. I tried your xstartup file again, but it still didn't help.