X11 Forwarding can't open display (client rejected?)
<p>I've read similar questions, and have applied the suggestions posted, but none seem to fix my issue...</p>

<p>In Putty, I've enabled x11 forwarding, with the 'X display location' set to 0.0</p>

<p>The remote Debian 8.4's X -version is  1.16.4, with the the /etc/ssh/ssh_config set to:</p>

<pre><code> ForwardX11 yes
 ForwardX11 Trusted yes
</code></pre>

<p>and /etc/ssh/sshd_config:</p>

<pre><code> X11Forwarding yes
</code></pre>

<p>I've also forced the DISPLAY variable to point to my local machine's IP:</p>

<pre><code> export DISPLAY=192.168.1.140:0.0
</code></pre>

<p>and verified it's set correctly (using 'echo $DISPLAY')</p>

<p>Finally, I restarted: 'service ssh restart' and 'service sshd restart'.   Unfortunately, when I enter 'xterm&amp;', I get the error 
"Can't open display: %s", and the locally running xming (Win8) never shows anything.  </p>

<p>The Xming log seems to show an authentication error:</p>

<pre><code> winClipboardProc - Hello
 DetectUnicodeSupport - Windows Vista
 winClipboardProc - DISPLAY=127.0.0.1:0.0
 winMultiWindowXMsgProc - XOpenDisplay () returned and successfully opened the display.
 winInitMultiWindowWM - XOpenDisplay () returned and successfully opened the display.
 winClipboardProc - XOpenDisplay () returned and successfully opened the display.
 AUDIT: Mon Jul 04 09:40:48 2016: 2508 C:\Program Files (x86)\Xming\Xming.exe: client 4 rejected from IP 192.168.1.151 

 [Note: the 192.168.1.151 is the IP of the BBB (ifconfig -a)]
</code></pre>

<p>I also verified that the Window's firewall is NOT blocking xming.</p>

<p>Not sure if it's significant, but the remote debian is running on a beaglebone black.  </p>