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{{MessageBox|backgroundcolor =#FBB|image = Using Warning.png|heading =WARNING|message = '''NOTE:''' This is for Fedora-based systems ONLY.<br />Guidance may not work for Amahi 7 or greater. Sorry, but if you break your HDA we cannot provide support}}{{NeedsUpdate}}  ----  <div style="border: 1px solid #A3B1BF; padding: .8em 1em; background-color: #E6F2FF; margin: 0px 1em;">'''NOTE:''' The one-click [https://www.amahi.org/apps/vnc VNC to use App] has been discontinued for Amahi 7 or greater. The reason is that it pulls a remote lot of packages, including desktop and that breaks DNS in the HDA Fedora.</div><br /> :'''NOTE:''' See [[TigerVNC]] for Amahi 8/9 (Fedora 1221/23) guidance.__TOC__ =VNC remote =
Using [http://realvnc.com/ VNC] is useful if:
* You would like to use a GUI to configure printer(s) or have a scanner or other device that requires a desktop program to configure and the machine is headless
== What you need ==
* A server
* A client
== Client: Installation ==
Download the client software and install:
* Windows: [http://realvnc.com RealVNC], [http://www.uvnc.com UltraVNC], [http://www.tightvnc.com TightVNC]
* MAC: [http://sourceforge.net/projects/chicken/ Chicken], [http://cotvnc.sourceforge.net/ Chicken of the VNC] - (do not use the internal vnc client because as there are some problemsissues)* For Linux, you have the vncviewer package, available in most, if not all distros. For Fedora 12, do the following as [[Open_Terminal_as_root|'''root''']] user:
yum -y install tigervnc
== Server: Installation - Method 1 == * To start There are various ways to get the server going in your HDA, you need install tigervnc-. All of them require the server rpm packagesoftware.# Amahi [http://www.amahi.org/apps/VNC VNC] application.# Manually as described below (notes may require some revision). === Manual Install ===* From Complete the '''steps in [[GUI_Install_for_Express_Disc|Express Disc Desktop]] guidance (Amahi 7 ONLY). * As root''' user, install the server
yum -y install tigervnc-server
chkconfig vncserver on
* Edit /etc/sysconfig/vncservers and change lines as follows (username is your linux user for the VNC session):
VNCSERVERS="0:username"
VNCSERVERARGS[0]="-geometry 1024x768 -nolisten tcp -localhost"
** Note you can have users 1-9 and each will connect to their VNC session at port 590n (some VNC clients 'know' the 590 part and only have you enter n)
** The -localhost options is needed if you are connecting through a ssh tunnel; if not do not use it
* Run vncpasswd for each user in VNCSERVERS= list; this performs the initial user setup.
* Start and stop vncserver to initialize vnc for each configured user
service vncserver start
service vncserver stop
* Edit /home/username/.vnc/xstartup and change the end of the file:
twm &
To:
exec gnome-session &
* Now finally start vncserver for real!
service vncserver start
* Run your VNC Client and enter hda:1 as the host/IP address. You should now see your HDA Desktop screen.
== ServerMethod 1 ==* Open a terminal, become root and install the VNC server (tigervnc-server) as stated in the Manual Install section. When the install has completed, press ctrl-D to end the root session. Leave the terminal open, or open one now. *The following commands are entered as '''User'''. * Type vncpasswd and press enter. The system will prompt you for a password. Type a password and press the enter key. The system will prompt you to verify the password. Type the password a second time and press the enter key. * Type vncserver and press the enter key. The system will create the configuration files. You should see output similar to this: xauth: Installation creating new authority file /home/user/.xauthority New 'host.localdomain:1 (user)' desktop is host.localdomain:1 Creating default startup script /home/user/.vnc/xstartup Starting applications specified in /home/user/.xauthority Log file is /home/user/.vnc/host.localdomain:1.log * You can edit the configuration files using your choice of editor. Nano is used below. Note that when "user" is shown, you need to enter your user name. * Type nano /home/user/.vnc/xstartup and press the enter key. Nano will open the file. Find the following line: twm & Change that line to read: exec gnome-session & This change will open the VNC display with a Gnome desktop, even if the server is starting in Init 3 by default. Press ctrl-X to exit Nano. You will see the prompt at the bottom "Save modified buffer (ANSWERING "No" WILL DESTROY CHANGES) ? Press the Y key. The prompt will change, showing you the file name. Press the enter key, this will store your change and exit Nano. *The following commands are entered as '''Root'''. * Type su and press the enter key followed by the root password You can edit the configuration files using your choice of editor. Nano is used below.Note that when "username" is shown, you need to enter your user name. * Type nano /etc/sysconfig/vncservers and press the enter key. Nano will open the file. Find the following lines: '#' VNCSERVERS="1:username" '#' VNCSERVERARGS[1]="-geometry 800x600 -nolisten tcp -localhost" * Uncomment both lines by removing the # at the beginning of the lines. Edit the lines so they appear as follows: VNCSERVERS="1:username" VNCSERVERARGS[1]="-geometry 1024x768 -nolisten tcp" Enter your username in place of "username". After "geometry", you can enter any resolution you desire. You can come back and change this if necessary. Press ctrl-X to exit Nano. You will see the prompt at the bottom "Save modified buffer (ANSWERING "No" WILL DESTROY CHANGES) ? Press the Y key. The prompt will change, showing you the file name. Press the enter key, this will store your change and exit Nano. * Finally, type chkconfig vncserver on and press the enter key. This will make the VNC server start when the computer starts. * Press ctrl-D to end the root session, and then press ctrl-D again to close the terminal. * That's it - Run your VNC Client and enter hda:1 as the host/IP address. You should now see your HDA Desktop screen.*If you are interested in more security for your VNC connection, check the link listed below under "General Instructions" * Repeat the configuration for each user you wish to be able to connect via VNC.* Note you can have displays for users 1-9 and each will connect to their VNC session at port 590n (some VNC clients 'know' the 590 part and only have you enter n). Make certain that you have forwarded the correct port(s), or the range 5901 through 5909.* Add - localhost to options if you are connecting through a ssh tunnel or only locally. This adds some security. == Method 2 ==
* To start the server in your HDA, you need install tigervnc-server rpm package:
* From the '''root''' user:
yum -y install tigervnc-server xinetd
chkconfig vncserver off
service vncserver stop
reboot now
== Server: Installation - Method 3 (the cpg method) ==
* Every time the HDA is rebooted, when VNC is needed, ssh to the HDA
* The first time without do:
vncserver -geometry 1550x1100
* After the firs first time, I type vncs. I have an alias in ~/.bashrc:
alias vncs='vncserver -geometry 1550x1100 &> /dev/null &';
* Since my HDA does not get rebooted often, this is not a huge problem
== General Instructions == 
More detailed instructions are available [http://www.g-loaded.eu/2005/11/10/configure-vnc-server-in-fedora/ here].
== Troubleshooting for Vista ==
This helpful page has helped with [http://www.windowsreference.com/internet-explorer/windows-has-blocked-this-software-because-it-cant-verify-the-publisher/ blocking VNC]
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