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Questions tagged [vnc]

In computing, Virtual Network Computing (VNC) is a graphical desktop sharing system that uses the RFB protocol to remotely control another computer. It transmits the keyboard and mouse events from one computer to another, relaying the graphical screen updates back in the other direction, over a network.

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Copy and paste from a QEMU VM with VNC graphics?

I run a headless server that uses qemu + kvm to run a few VMs, and I manage them with virsh + xml file definitions. Because this a remote / headless system, I set the graphics as VNC, and then with ...
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Using graphical applications on both vnc :1 and main display :0

I start /usr/bin/Xvnc :1 a gnome window manager of centos on boot, via systemctl script, as I sometimes like to connect to my machine via a different box. When I first installed and started slack, it ...
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How to block rdp passwords brute-forcing? [closed]

I've noticed there are significant spikes in cpu consumption on my servers due to bots trying to brute force my rdp password. I tried to change an rdp port, it helps for a while but then it resumes. ...
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290 views

Does Apache Guacamole support VNC Connection with GNUTLS?

Currently I've working on my custom Remote Desktop Service which is strongly based on Apache Guacamole. I want my whole session encrypted with TLS when I enter Guacamole and connect to my PC with a ...
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VNC viewer shows black screen without VPN access only

I access to a Siemens HMI screen which natively includes a VNC Server. I get a black screen when connecting either with TightVNC or VNC Viewer. After a few seconds, the VNC connection ends up and the ...
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118 views

VNC server won't start on AlmaLinux/CentOS 8

I could not get tigervnc to start on my AlmaLinux 8 machine. We have SELinux enabled and our home directories are automounted NFS shares (configured by IPA). I see errors in my /var/log/audit/audit....
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Scraping VNC server on Alma Linux 8 and Gnome

I am trying to get a scaping VNC server on display :0 (the physical display) working on Alma Linux 8 with GNOME (GDM 3.28.3). No matter what I try, I cannot get the actual display shared over VNC. We ...
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Google 403 Error

I am experiencing a very odd issue. So for some context here, I have a dedicated server that I pay monthly for. That dedicated server comes with a pool of IP addresses (USA IP's). I created a few VM's ...
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apache2 vnc proxy to proxmox (with intermidiate php application)

he have a php application that has access to proxmox and display the vnc console by sharing the token. this is in a apache2 server. We try to proxying the vnc requests behind apache so the end user ...
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Strange viewport layout when connected to x11vnc with Remmina

I set up a clean qemu/kvm virtual machine with Ubuntu Desktop 20.04 and trying to connect to it using Remmina (client) / x11vnc (server). But I noticed a strange behavior. It looks like the actual ...
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CentOS: Admin user on xrdp session can't do admin

I'm running a Rocky Linux 8.4 workstation with GNOME and MATE desktops, but I've seen the same problem on CentOS 7.9... When I log into the machine on the local display, I can do things like ...
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How to start a VNC viewer to display all previously saved VNC viewer desktops (that are now destroyed)?

Problem: My current VNC viewer (let say VNC viewer 'A') resides on a machine (let say machine 'A') that need to be killed because our IT department need to rebuild the machine 'A'. I have a lot of ...
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guacamole users with admin perms

I installed guacamole from source after a few hours of toil and trying out serveral outdated guides. But at this point I can go to the site and log into the guac web interface and connect to the guacd ...
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141 views

TightVNC / VNC - execute commands inside VNC session from cronjob or just from outside shell?

I have an application that cannot start without GUI, so I need some virtual display like VNC provides. I boot VNC on start What I want to do is run something each hour inside the VNC, without having ...
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VNC Access on Centos 8

I tried to create a vnc session on centos 8 but it showed the below message. Please read /usr/share/doc/tigervnc/HOWTO.md for more information. I followed below instructions, Assigned the port to ...
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VNC black screen with working cursor after killing VNC session

My VNC session was lagging to the point that I couldn't really use it so I ran pkill -u myUsername from inside the VNC session rather than through ssh (dumb, I know) and ever since all I get when I ...
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Can't SSH into macOS machine until I VNC

I have several M1 Mac Minis running on MacStadium. They are all remotely manageable, so I can SSH and VNC into them with the auth I was given. From time to time, the following happens: I suddenly ...
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1 vote
1 answer
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Trying a VNC for the first time

I've never used a VNC or any remote login programme before So I'm trying to use TigerVNC. However, I'm open to suggestions, I'm happy to try any VNC programme, I just want to get something working. I'...
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Vnc connection through nginx reverse proxy

novnc connection through nginx reverse proxy is not working propraly i m using nginx version 1.14.1 events {} http { server { listen 80; location / { proxy_set_header ...
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x11vnc can not connect to X server of gdm greeter

OS: CentOS 8.3 GDM creates a X server for the greeter, and a different one each user that logs in. I am trying to run x11vnc to enable remote access to the machine, but x11vnc is rejected by the X ...
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-1 votes
1 answer
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How to bind a VNC port with a KVM?

How can I bind a VNC port with a specific virtual machine (KVM) so after a reboot of the host server all ports would remain the same? Right now the numeration of ports is based on the order of ...
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2 answers
1k views

Can't access VNC port from local network

I've installed VNC on CentOS and enabled it on port 5901. I made sure that selinux, firewalld and iptables were disabled/stopped on the system for troubleshooting purposes. Now I can successfully ...
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Creating VNC session on specific port fails even though the port is clear

Sorry in advance for the huge amount of command output text, I thought it would be more clear than paraphrasing myself. I am using CentOS 7 and tigervnc: (base) [carlos@pulsar .vnc]$ cat /etc/centos-...
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6 votes
5 answers
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Reducing Latency Between US and India/South Asia or Desktop Access on CentOS 7+ GNOME

We have a server in US DC that is getting accessed from US and India, S Asia and SE Asia. With 128GB RAM, CPU and Cent OS 7 + GNOME desktop and it runs VNC server - the server gets access through VNC ...
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Blocking right-click/keyboard on a VNC server

I'm planning to host an application I don't have the source for via VNC in a kiosk mode kind of manner. A flash game running server-side, to simplify matters. First, only part of the window should be ...
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1 vote
1 answer
263 views

Most secure way to connect from Windows 10 to a CentOS8 Shared Desktop

i tried to connect to a CentOS8 desktop from a Windows 10. In CentOS8 I have enabled the Sreen Sharing feature. Then i have tried to connect to the ip address of my CentOS8 from a Windows 10 with ...
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xrdp not connecting on centos 8, how to fix that?

I have used below steps on my cloud machine. Allowed all ports on azure machine(No security for testing). Installed GUI. sudo dnf groupinstall "Server with GUI" installed xrdp and vnc. ...
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1 vote
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Having a Secure / Copy Protected DESKTOP Environment in Cent OS Linux

We have a VPS / Bare-metal server rented on a data-center and we access them over internet through user ID and password. It is running CentOS 7. That is direct access and there's no VPN in between. We ...
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877 views

Ubuntu 20.04 LTS Server - KVM with Spice or VNC

I am wondering if anyone has gotten Spice Server or VNC Server to work remotely on ubuntu 20.04? I would be glad to make a video tutorial once I have it working correctly because I can barely find ...
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1 answer
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Is it possible to control the system only from remote connection using VNC Server?

I have a Linux computer with VNC server running in it. When I connect to that computer remotely from another computer using a Remote Desktop Viewing application, the main computer display is still ...
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1 vote
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Can't select install options when running Debian in headless QEMU/KVM

I am trying to get a Debian VM running on my Arch Linux machine using headless QEMU/KVM. To begin, I boot the virtual system with the following command: qemu-system-x86_64 \ -cdrom ../iso/debian-...
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1 answer
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Tightvnc Server using only 1 core?

I have a server setup with 8 cores and 32gb of RAM. I am using it to launch as many java applications as I can and hope to make the most efficient use of my resources. Upon launching I notice the ...
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1 answer
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Unable to connect to CentOS 7/8 Screen Sharing (VNC) over work VPN

As with most people, we're WFH. It's getting difficult to troubleshoot issues via chat/phone, so we'd like to use the CentOS "Screen Sharing" feature, which comes bundled with the OS, to ...
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VNC server with multiple users

I assigned each user a VNC port, but when start the services I see this errors: root@kensa-dev-server1:~# systemctl start vncserver@2.service Job for vncserver@2.service failed because the control ...
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2 votes
5 answers
11k views

Accessing Ubuntu 20.04 from Mac OS Catalina: which client to use?

I have a clean install of Ubuntu 20.04 and have setup screen sharing. It gives me an URL to use to access the desktop, something like vnc://my-computer.local When I type this in a web browser on the ...
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1 vote
0 answers
163 views

No packages in any requested group available to install or update on Centos 7 when installing XFCE

I have a GCP instance running Centos 7 and am trying to follow the instructions here to get vncserver running but I keep getting: Maybe run: yum groups mark install (see man yum) No packages in any ...
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Differences of Docker vs. Docker-Compose attaching to user-defined bridged network

Environment I'm trying to setup User-Machine: dockerized VNC-connected containers (in Docker network vm_network) for different purposes These should be connected by the user using Guac: Apache ...
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161 views

VNC client only sees a terminal

I have tightvnc server running on my Xubuntu 16.04. I can then run this command : xvnc4viewer 192.168.1.2:5901 I can connect successfully to my machine but the only thing I see is this : I guess ...
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1 vote
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170 views

VNC error during live migration of KVM vm

If I live migrate a KVM vm from host 1 to host2 then I get error for vnc. Is there any way to change the vnc dynamically before the migration starts. I donot want to stop and start my vm before or ...
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putty disconects after a cople of minutes when using it to make a X tunnel for kvm VNC console

I am using putty from a windows desktop to make an X tunnel so I can access my KVM VMs VNC console (I am using TightVNC) but the putty connection dies after a few minutes. I have other ssh ...
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0 votes
2 answers
808 views

How can I setup a dual SSH tunnel so that two machines A and B behind firewalls ssh into a central sever such that A can VNC into B?

I need to connect via VNC from my machine A to another machine belonging to my friend B. Both of us have no way to open incoming ports - ISPs do not allow tunneling unless you buy a static IP based ...
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2 answers
2k views

Open Source Remote Access using VNC and Reverse SSH

I am trying to get a remote access approach (open source) working involving openssh and tightvnc that deals with NAT, that allows someone to remote to my server and then allows me to vnc back to their ...
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2 answers
669 views

How to install x11vnc in offline mode?

I am trying to install x11vnc on linux machine which doesn't have internet on it.So i won't able to install using sudo apt-get install x11vnc command. Can someone please help me install x11vnc with ...
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0 votes
1 answer
688 views

Bind VNC over SSH jump host tunnel to something other than localhost port

I know how to use a jumphost to create an VNC SSH tunnel ssh -A -N -L 5901:targethost:5901 jumphost however, that binds to the localhost of the initiating machine. So if I want to bind to many hosts ...
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0 votes
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which means double 2 points 192.168.1.2::3 in a vnc connection

install real vnc to make connections to a windows server but at the time of accessing me it appears that to access I must approach it with the route 192.168.1.2::3 I understand that : after the IP ...
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Giving VNC access to screen shared via Xvnc

Let's say I want to share a screen with someone. I want this person to be able to control one application in this screen (the application is started with my user). To do that I am doing the ...
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1 answer
1k views

SSH Port Forwarding not working

I have two CentOS 7 servers (Hypervisor and Relay for this scenario) . I wish to connect to a VNC port on Hypervisor which is behind a firewall by using Relay with is a server with SSH open to ...
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1 answer
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VNC ISPSystem glitches on high resolution

I am trying to perform an installation of Android x86 8.1 RC2 on VPS through the means of ISP panel, via VNC. Here is what I see in any VNC client (noVNC, VNC Viewer): Such a bug only appears after ...
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381 views

tigerVNC and XRDP are causing android studio GUI windows to be whited out

So, I recently deployed an Appium server on a physical dl320 so we can automate our mobile app development. I am using an older version of KVM that only allows one console connection at a time. This ...
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6 votes
1 answer
6k views

How to set keyboard layout with a VNC client to KVM (libvirt)

I have both kvm guests and hosts installed on a Debian 9.9 with kde on an AMD Machine qemu-kvm 1:2.8+dfsg-6+deb9u7 amd64 When connecting with a virt-viewer, my keyboard ...
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