Re: How to tell if tightVNC client is installed on a linux machine?

Hello Fran,

"Guy who set this up is gone." I hate when that happens :-(

As to your detailed questions...

1 - Yes, the Win 10 machine you wish to connect TO and access remotely runs the VNC server. The machine you sit at and connect FROM uses the VNC client.

2 - I do not know what role your Linux machine is filling (I will guess in a moment). If you are sitting at the console (monitor and keyboard) of the Linux machine you would need the VNC client on the Linux box. Otherwise, no. If the Linux machine is serving as some sort of VPN, firewall, gateway etc. which allows your remote laptop to connect to your internal network from the outside... A) that is a whole different question/concern as to how to configure it B) your remote laptop should just pass its traffic through the Linux machine to/from the target Windows 10 computer. The remote laptop would run the VNC client which would connect to the target Windows 10 PC-1 machine's VNC server.

3- As you can connect to the Linux box the way to check for the VNC client depends on the flavor of Linux you are running. It it is in the Red Hat/CentOS family you can try:

rpm -qa | grep tight

That should find something like xtightvncviewer. If nothing comes back there is nothing with "tight" in the name installed. However, on CentOS 7 or RHEL 7 you will more likely find the vinagre viewer. On my CentOS 7 machine:

rpm -qa | grep vin
vinagre-3.22.0-12.el7.x86_64

If the Linux box is Debian/Ubuntu/Mint or something in that family you can try:

apt list --installed | grep tight

Here you should get a result like:

xtightvncviewer/bionic 1.3.10-0ubuntu4 amd64

4 - Launching the VNC viewer on the Linux machine from a Putty connection would not do what you need. Putty is simply a text based terminal. VNC is graphical. You need to launch the viewer on your remote laptop and then connect to the target Windows 10 PC-1.

As far as next steps...

- Were you able to connect from the remote laptop to PC-1 before the other guy left?
- Do you have any information about the purpose/configuration of the Linux machine?
- We might start by looking at the networking setup on the Linux machine. Run the following command and paste the results into a reply:
ip a
This will show the various network. One note of caution...
Several IP addresses may be shown in the output from the command. If you see your Internet address as provided by your ISP you might want to replace that with xxx.xxx etc. Addresses which start with 10. or 192.168. are internal address and are of no security/privacy concern. An entry like this is OK

2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
link/ether 1c:69:7a:0f:d4:54 brd ff:ff:ff:ff:ff:ff
inet 10.42.0.86/24 brd 10.42.0.255 scope global dynamic noprefixroute eno1

If you need help identifying your Internet IP address please ask first.
- Do you have the root or administrator password for the Linux machine or did the gone guy take it with him?

Ken

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Friday, June 19, 2020 7:44 PM, Fran_3 via VNC-Tight-list <[email protected]> wrote:

> Trying to log on to a Ubuntu Linux server using PuTTY and find out if TightVNC client is is installed on the linux box.
>
> The linux box is on a small peer-to-peer network with a couple of Win-10 PC's.
>
> The Win-10 PC's have TightVNC server on them and we normally access them remotely through the Linux box by using a Win10 laptop with MobaXterm setup on it.
>
> Guy who set this up is gone.
>
> I want to skip MobaXterm and use PuTTY to log on to the Linux box.
>
> I can in fact log on to the Linux server using PuTTY on the off site laptop... but what to do next is the basis for the 4 questions that follow...
>
> First Question:
> As I understand it...
> - the Win10 PC we want to access is running VNC server
> - the other PC is running VNC client... right?
>
> Second Question:
> In this case would the Linux box be running the VNC client or would I need VNC client on the laptop at my off site location?
>
> Third Question:
> As I can now log on to the Linux command line using PuTTY... is there a command I can run to see if the Linux box has the VNC client on it?
>
> Fourth Question:
> If the Linux Box is running VNC client, what command line instruction would I give it to launch the VNC client interface so that I can instruct it to connect to the VNC server on PC-1 on the local network?
>
> Remember, I'm remote using a Win10 laptop and connecting via PuTTY to the Linux Server which is on the same local network with the 2 PC's each of which has the VNC software on them.
>
> I'm new to all this so thanks for your patience and assistance.
>
> Fran

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