title: VNC Mac OS X and Linux connection refused by computer
body: <p>I am having issues using VNC between MacOS X and Linux.</p>
  
  <p>I installed tightvnc server on CentOS Linux and vncviewer on Mac OS X. I have done all the setting to my best knowledge and then started vncserver on the Linux computer. I also opened the port 5901.</p>
  
  <p>When I execute the command "vncviewer :1" on the Linux machine, things work fine. I can see desktop appear in a window.</p>
  
  <p>From Mac OS X I am unable to connect to the Linux vncserver. The message I get is 
  <strong>"The connection was refused by the computer"</strong> </p>
  
  <p>I am able to SSH from Mac to Linux so there is connection between the two computers but VNC won't work.</p>
  
  <p>Can someone please help me save this issue. I have searched the web but found nothing that worked thus far.
  Thanks!</p>
  
  <p>Here is the message from the vnc log file.</p>
  
  <pre><code>Xvnc TigerVNC 1.1.0 - built May 11 2016 13:01:55
  Copyright (C) 1999-2011 TigerVNC Team and many others (see README.txt)
  See http://www.tigervnc.org for information on TigerVNC.
  Underlying X server release 11704000, The X.Org Foundation
  
  
  Tue Jan 24 10:03:36 2017
   vncext:      VNC extension running!
   vncext:      Listening for VNC connections on all interface(s), port 5901
   vncext:      Listening for HTTP connections on all interface(s), port 5801
   vncext:      created VNC server for screen 0
  GNOME_KEYRING_SOCKET=/tmp/keyring-jWrQoB/socket
  SSH_AUTH_SOCK=/tmp/keyring-jWrQoB/socket.ssh
  GNOME_KEYRING_PID=7644
  gnome-session[7629]: WARNING: Could not launch application 'linc-cleanup-sockets.desktop': Unable to start application: Failed to execute
   child process "/usr/bin/linc-cleanup-sockets" (No such file or directory)
  Failed to play sound: File or data not found
  
  (polkit-gnome-authentication-agent-1:7668): GLib-GObject-WARNING **: cannot register existing type `_PolkitError'
  
  (polkit-gnome-authentication-agent-1:7668): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
  An instance of nm-applet is already running.
  Dropbox isn't running!
  Dropbox is already running!
  Initializing nautilus-dropbox 2015.10.28
  (null):  Warning no default label for /home/amit/.gvfs
  Failure: Module initalization failed
  
  ** (gnome-panel:7657): WARNING **: panel-applet-frame.c:1288: failed to load applet OAFIID:GnoteApplet:
  (null)
  </code></pre>