The port on which the computer is listening could not be contacted raspberry pi. Couldn’t get to a specific workstation.
The port on which the computer is listening could not be contacted raspberry pi However, after enabling, nothing is listening on port 5900, and here is the output of: journalctl | grep vnc Aug 10, 2022 · Ways to fix this: Check the remote computer is switched on. I've tried several times to establish connections to localhost, but I always get this error: May 15, 2020 · But the port number is configurable and not always the same in some installations. There's a software firewall on either the local or the target machine What service on the raspberry pi is running on port 9000? The port will look closed if there isn't a service running on that port on the pi. Replace ipaddress with the output address of ifconfig run from your Pi. 1640024891: Opening ipv6 listen socket on port 1883. May 30, 2020 · Similarly, the Wayland security model prevents traditional remote desktop access, and so a new VNC server, called wayvnc, is being used instead of RealVNC. 1:2947 0. I logged into my google fiber router and gave my Pi a reserved static IP but didn't set it as my DMZ (different guides were conflicting on this step). so it would seem to be set up correctly. Most displays don’t have micro or mini HDMI ports. If you are running a software firewall on the pi, you might need to configure that so it will listen to that port. I would like to use this terminal connected to my Pi Zero 2W; so I connected the device to the USB port on the Pi, and booting raspbian in console mode. Feb 25, 2023 · I need to check a Python server and client on the pi4B. 2. Oct 18, 2017 · If I try from Ubuntu 16. 1640024891: Opening websockets listen socket on port 9001. If I manually set it to only run on UDP, then it's not listening on Apr 9, 2021 · All of a sudden, my vncviewer is not bringing up my raspberry pi im trying to log into. If you add the "p" option to netstat, it will show you the processes involved. vnc/passwd -display :0 -rfbport 5900 Server (please complete the following information): OS: archlinux kernel May 13, 2025 · Learn how to connect your Raspberry Pi to any monitor in 2025 with this complete, step-by-step display setup and troubleshooting guide. Single-board computers (SBCs). Oct 31, 2016 · What are they about? The 2nd and 3rd lines show an established TCP connection using the internal loopback address. In it's default configuration, netstat shows it only listening on TCP 5900. The Pi is running GPSD, and I'm struggling to get it to pick up the messages. I'm able to connect to it locally, both via SSH, and accessing other open ports with a dummy listener that I created. s. 04. Aug 13, 2023 · Learn how to check open ports on Raspberry Pi using commands like ss and Nmap. The Pi in question is a Raspberry Pi2 with Samba and Plex Media server running on it. May 17, 2022 · External port on the router WAN could be any port as long as not occupied by other services. And by default, UDP is supposed to be preferred (for better performance) with TCP fallback. You then configure the Pi to listen for SSH on this port. Raspberry Pi keyboard computers combine SBC hardware, a full Linux operating system, and common ports inside a compact keyboard case. Keyboard computers (X00). Port forwarding allows computers outside your local network to access your computer. I am trying to set up a simple outgoing mail server to send emails from my Pi hosted webserver. I Jun 19, 2014 · I can connect to this webserver from another computer and from the Raspberry Pi using the "external" IP address (eth0). Opening a port on your Raspberry Pi involves configuring your firewall to allow network traffic to reach a specific application or service running on your Pi. But if I try to connect via "127. When i try to connect via VNC Viewer, it says: The port on which the computer is listening for a connection could not be contacted. Raspberry Pi OS Lite doesn’t include Connect by default, but you can install Connect Lite. 1 is the IP LAN address of the Raspberry Pi 3 B+. First thought is that -as usual on X11- listening on tcp is not enabled. exe. Ensure your device is secure with nftables firewall. Basic system is running fine, including wayvnc. Aug 19, 2014 · But I still run Raspberry Pi 3 B+ programs (LAN) ending with app. 1488655160: Opening ipv6 listen socket on port 1883. Dec 27, 2023 · Not to worry – this is a common problem that I‘m going to help walk you through fixing, my friend. To resolve this issue, change the other program or service, or select a new, unique port for VNC Server. Port 5900 is Nov 3, 2011 · First interaction with the board Connect the serial cable to the COM port in the Raspberry Pi, and connect the other end to the COM port or USB Serial Adapter in the computer. The combination of IP address, port and protocol is called a socket, and has to be unique for every service. Is there a way to fix this or possibly roll back to to the previous version? Jan 19, 2017 · I seem to have a problem with forwarding port 5900 on my router, to fix my problem I need to change the listening port of realvnc on my PI, anyone can provide me with help ? p. macOS: Ventura Oct 30, 2023 · Netstat is a powerful command line utility that allows you to check for open ports and active network connections on Linux systems like the Raspberry Pi. Connectivity RealVNC Viewer may Jun 19, 2023 · On that machine running the ancient VNC, I can run netstat -ano | find "LISTEN" | find "5900" and see that there is a process listening on port 5900, and as expected, tasklist shows that the process is vncserver. Ensure antivirus software lists VNC Server as an exception, and the firewall is configured to allow access on VNC Server’s listening port (5900 by default). created DDNS from my router I have even enabled DMZ to allow all traffic to raspberry It is able to connect to raspberry pi when I am on the same network but couldn't connect via the internet. 0 (all addresses) address. Jan 24, 2017 · I have a Raspberry Pi 3 Model B I have been connecting to with VNC Viewer for over a month. " Oct 21, 2025 · If the recommended resolution does not fix your problem, or if you cannot find your error message, please contact our Support team. When I start my server, here is what is displayed: Jul 18, 2018 · Hello, I have a Raspberry Zero and a Fritz Box 6820 LTE. Connect is installed by default in Raspberry Pi OS Desktop and Raspberry Pi OS Full (desktop with recommended software). Feb 13, 2018 · Specify a number between 1 and 65535 representing an available TCP port on which VNC Server can listen for direct connections. Pages (2): 1 2 Next »Users browsing this thread: 1 Guest (s) Jan 26, 2014 · Can I access my RPi 5 (bookworm) desktop from Android device Hi, I've tried to find a step by step guide to remotely connect to my new raspberry Pi 5 desktop via my Android tablet. Can someone help me out to point me in the right direction to change the port please? Joseph I think that this has worked, because an online port check tool reports that port N is open, but the standard port is closed ("connection refused"). Now trying to get Xwayland and remote X applications running. I use a virtual desktop. That is, connections from the computer to itself. However, you can use a micro-HDMI-to-HDMI cable or mini-HDMI-to-HDMI cable to connect those ports on your Raspberry Pi to any HDMI display. From your Pi: Code Sep 10, 2019 · Hello, I'm currently attempting to port forward port 25565 to set up my Minecraft server running on a Raspberry Pi 3 Model B+, but no matter what I do, port checker tools such as canyouseeme. Our first thought was firewall, even though it is supposed to be off When I scan the ports open on the pi from my laptop I only see the ssh and vnc ports, but when running the netstat on the pi both ports appear to be in listening state. In WebRTC this is typically the responsibility of the TURN server. vnc/xstartup file. Although the console does not Oct 19, 2017 · It sounds like you have enabled port forwarding to your laptop's internal IP. Oct 28, 2016 · Given that your Pi is headless, depending upon which RealVNC mode the server is running, you may need to modify config. Jun 29, 2017 · The default configuration file should have automatically opened the port and be listening. Jul 21, 2018 · I have my first Raspberry Pi 3, model B, up and running. 1" or localhost, I get "connection refused". m22's wiring. For Raspberry PI connect the STUN server address is used also for the TURN server, but on a different port (443 instead of 3478). My router already forward many other ports for other services and I know they work, it just the 5900 that seems to be blocked, I made sure that the router '' WAN acces '' was disabled as I read on another post that Dec 4, 2015 · However, when I try to connect to the Pi using RealVNC VNC Viewer on the iPad I get the following error message: "The port on which the computer is listening for a connection could not be contacted. The listen port is 9090 and the Server port is 5901. Aug 28, 2023 · If it isn't, you won't be able to connect. Sep 1, 2020 · After disconnecting a small flash drive from the Pi I, no longer got that port conflict message, so I reverted back to the default port of 5900. This is a bit more restrictive in terms of the client applications which can connect to it — we have had good results with the TigerVNC client, available here. Nearly all of them use the web to share a camera feed however each time I get to the stage where you view the feed from the raspberry pi on local host it says "Could not connect. Make static IP for Raspberry pi in my router. But when I try to access via RealVNC Viewer on my PC it timed out before connecting and from my phone I got the following message: “The port on which the computer is listening for a connection could not be contacted”. However, if your Pi is headless (not plugged into a monitor) or not running a graphical desktop, RealVNC Server can still give you graphical remote access using a virtual desktop. " Where is the 'COM' port on the Raspberry Pi and what plug do I need please? Jan 29, 2024 · I'm trying to set up port forwarding on my new Pi 5. Get expert answers for the error "the port on which the computer is listening for a connection could not be contacted. Now it all works fine. Jan 26, 2014 · I found out, if you are using a 32 bits version of Raspberry Pi OS 12, and RPi / CM 3 or older, Real VNC Server will be used instead of the new wayland system and wayvnc. You've got the wrong IP address and the machine you've reached, obviously, doesn't have port 22 open. This allows external devices or services to communicate with your Pi, enabling functionalities like hosting a web server, accessing files remotely, or controlling devices connected to the Pi. Jul 30, 2012 · When you log into the Pi, run the command below to make sure that 'sshd' is really listening on port 1024. This seems to be related to the VNC Server not working correctly. Dec 3, 2021 · I have a PI 4 with ethernet connection and I am unable to connect to the pi from any external connections (SSH, VNC, or Nginx). To accept connections over Ethernet you should listen on a host that resolves to the IP address on interface eth0. vnc/passwd or x0vncserver rfbauth ~/. 1 port 3350" and it carries on. With netstat, you can easily see which ports are open, what programs are listening on ports, and monitor network activity. Nothing else is running on Oct 6, 2015 · I am able to remotely connect to my pi via ssh on it's IP address (which I have configured it to be fixed). But with the newer version of VNC server, netstat doesn't show anything listening on port 5900, or anything close. However, after I deleted all the Python files on the Raspberry Pi, I encountered an 'Error: The port on which the computer is listening for a connection could not be contacted' issue. I would be thankful if some body help me in this matter thanks ! Dec 16, 2013 · When I use -an I can't see port 80 eitherBut the website definitely works, and I've checked the Apache config and it says port 80 is listed soWhat's going on?! Jan 27, 2022 · Info: Listening on port 4444 for telnet connection I haven't been able to discover why, or what to modify to get openocd to stop listening and let the pico run the program. Sep 10, 2015 · Raspberry Pi 4 with bookworm 64 bit, newly installed from the Raspberry imager today and configured for use of Wayland. Is it possible to change that 5901 to a different number? I have tired to look online I found many vnc servers but not for this one. Just follow these steps below to troubleshoot why SSH is giving you the cold shoulder on port 22 and how to get back up and running. txt rebooted my pi and when I go into VNC viewer I just get The port on which the computer is listening for a connection could not be contacted. 127::80 Mar 2, 2017 · Your problem indicates that your Raspberry Pi was reached by the connection attempt, but that no service was running on the relevant port and hence the connection was refused. I made a port forwarding rule for my router's WAN IP on port 22 to forward to my Pi on the LAN on port 22. Feb 6, 2023 · "the port on which the computer is listening for a connection could not be contacted" if i instead start the server from the terminal and leave running i get the same behavior x0vncserver rfbauth ~/. All external connection results in connection refused but I can access these services just fine within the Pi. It has ALWAYS worked before and I've never had a problem with Aug 17, 2017 · Thanks PiGraham and Klricks I have done the hdmi hotplug change in config. We have a server and computers on a different, trusted, domain. Mar 31, 2025 · If possible. I have EXIM4 installed and checking oddly it is not running on ANY ports. To use Connect, link your device with a Connect account. Use Raspberry Pi Connect, a free screen sharing and remote shell service provided by Raspberry Pi. Several LED's should go on to signal a connection, if not the LAN9512 chip isn't working. May 10, 2024 · Anytime I try connecting via realvnc I get the error “The port on which computer is listening for a connection could not be contacted”, I’ve rebooted both devices, checked my WiFi and internet, disabled and enabled vnc through raspi_config, and enabled both x11 and Wayland but I can’t seem to connect, any reason why? Jan 25, 2017 · I have followed in below way: 1. See if you are attempting to establish a direct connection over the Internet. Feb 26, 2015 · Algum dia vc ja usou o seu Pi para fazer console serial a algum outro equipamento usando um adaptador serial/usb ? caso sim , parece que alguma aplicação está tentando utilizar o acesso serial via usb porem cmo não esta conectado não funciona. Below is output from my Pi, but of course it is using the standard port 22. txt to "force" an HDMI display since, if there is no physical HDMI connection, a Pi will default to SDTV (composite video) settings (perhaps not fully supported by your viewer/other computer). It is advisable to prevent a remote computer sleeping or hibernating while remote access is required: Windows: In Control Panel > Power Options > Change when the computer sleeps, make sure Put the computer to sleep when plugged in is Never. mosquitto. I connected the Pi to the router and set it up (also enabled ssh in raspi-config). 1) then you only accept connections over the loopback interface, lo. Thank you for the suggestion, the VNC app, when I try to connect, offers this error: 'the port on which the computer is listening for a connection could not be contacted'. i installed xfce4 and set the ~/. Dec 26, 2019 · I'm currently 100 miles away from said Raspberry Pi, and it's suddenly stopped listening for cloud connections through no intervention of my own. Dec 13, 2021 · The port on which the computer is listening for a connection could not be contacted. It is better for LAN security to create a free account (non-commercial use only) and sign in over the web connect feature provided by RealVNC free of charge. Today we had a different twist on this issue. May 20, 2015 · Trouble getting GPSD to listen on UDP port 10110 Fri Feb 03, 2017 5:34 am Hi all, I've got a GPS device on my network which is sending NMEA reports on UPD port 10110 to a Raspberry Pi. I've tried a purge and reinstall and it changes nothing. 127:80 for port 5980, and ::<full-number> for all other ports, for example 192. This would be less likley detected by port scanning software that is looking for known services. Learn how to port forward Raspberry Pi with our easy to follow guide. Not sure why Apr 18, 2022 · "The port on which the computer is listening for a connection could not be contacted". 3 - When I then try to use the command ssh pi@ [global ip address] -pN (with or without the port flag) from another computer with my local network I get "connection refused" messages. Mar 18, 2017 · If ServerApp run on the Windows, all systems work because I configured this port on firewall but if ServerApp move from Windows to Raspberry, systems doesn't work on over internet connection. 168. 1. 0:* LISTEN 296/gpsd Oct 28, 2023 · Hi, I'm trying to start a python server on my raspberry pi 4, and conect to it through my computer, connected to the same network (my mobile access point). Apr 1, 2024 · Have you entered the remote computer’s IP address or hostname into RealVNC Viewer correctly, including a port number if required? If RealVNC Server is not listening on port 5900, enter :<1-99> for ports in the range 5901-5999, for example 192. The Initial Dread: Why is SSH Not Working On Raspberry Pi? When connecting to localhost:1 it says "The port on which the computer is listening for a connection could not be contacted" how do I fix this? Sep 30, 2019 · I could browse localhost on pi, but when browse from another computer in the LAN, I only see text of the page, rather than the normal page with pictures. Expose SSH or VNC on your Raspberry Pi over the open internet, within a VPN, or using an external service like RealVNC’s cloud VNC Viewer. Mar 23, 2021 · Be aware of a few things that could impact this: Do not open your router firewall to allow VNC from the Internet. Unless your laptop and PI are on the same IP address you would need to change the existing forward or add another to the PI's IP addr. Small and Nov 3, 2011 · I am running Pi64 OS (latest updates) so I am not sure if this is a bug or a config issue. org always report the port as closed, and I've confirmed that external connections can't resolve the Jun 21, 2016 · Hello , i have download the vnc4server on my pi3b+. Not sure yet what to use it for but I have set up a (CherryPy) web server, listening on port 8080. vnc/xstartup Log file is /home/luis/. Can't fault marcospaulo. Then I figured out the public IP, opened port 22 (i know, security risk), and tried to connect, but I only got a The problem seems to me to be on the Ubuntu server, like I’ve got the wrong port configuration, but I’m at a loss. Apr 27, 2020 · I can ssh into the pi perfectly fine. Jul 26, 2013 · matt12345 wrote: server = TCPEchoServer ('localhost', port) If you listen on localhost (127. . Oct 20, 2020 · The Arduino IDE image says Due. 1488655160: Opening ipv4 listen socket on port 1883. 1’, port=80, debug=true) Where 127. This may or may not be related to the VNC Server (since you are grepping for 59, and the port numbers used here appear to be random, ephemeral ports). It may be that the remote computer is asleep. Only I can't find how to run or open port 8080 on the pi4B. Note that ports 1 to 1024 are restricted by some operating systems. If you don't have many devices connecting to your pi sometimes deleting known_hosts will let you log in again. Jun 29, 2015 · Connection refused means one of three things. I am running the latest version of raspbian (image had a ssh and vnc disabled by default, I enabled it in pi configuration (raspi-config)). (These are really old X Mar 4, 2017 · Re: MQTT not listen on Port Sat Mar 04, 2017 7:22 pm Starting mosquitto from the command line root@home:~# mosquitto 1488655160: mosquitto version 1. One of the most common tasks that Raspberry Pi users need to do is open port 443. Remote X client applications fail with "Unable to open display". Forwarded port number 5900 internal and external 3. thanks Have you got another Pi or another computer running linux? If yes ssh -vvvv pi@ipaddress will generate about 2 screens od data on a terminal. " Join our Q&A for solutions and tips! Aug 24, 2019 · how to fix the port on which the computer is listening for connection could not be contacted #146 New issue Open sanjay19981 Nov 26, 2013 · Sometimes this is caused by a not working LAN9512 chip, its easy enough to check if its working though, just plug in a ethernet cable connected to any kind of Ethernet device into the PI's Ethernet port. Connect to the Pi with PuTTY and run the vncserver command in the terminal. connection refused" yet no one in the comments seems to be having this issue. I then see "connecting to sesman ip 127. With serial, you might miss the first few, but it should settle down quickly. The next step is to be able to connect to the web site from a browser on my laptop or mobile The port is used to distinguish the application. Why Bother with SSH for Raspberry Pi Anyway? Troubleshooting SSH Connection Issues on Raspberry Pi If you are unable to use PuTTY to access your Raspberry Pi and suspect that port 22 might be closed, follow these steps to diagnose and fix the problem. I can give my Due a try if this still goes nowhere. Pick a random port number, say 49500 and open this for both directions on your router. Jun 11, 2014 · Here’s an interesting quandary we are in. Jul 20, 2019 · "The port on which the computer is listening for a connection could not be contacted" I believe it may have something to do with the VNC tunneling to the SSHDoes anyone know how to set up the tunnel on JuiceSSH? Oct 26, 2024 · I was using my Raspberry Pi remotely via VNC Viewer on my iPad without any issues. For example, it may be that VNC-compatible Server software from a third party is already listening on this port. But I can't find this app in the Google Play Store. It's a 3. I run some test software and am able to subscribe to data from test. " Jun 16, 2013 · I've read several guides and searched this forum, but still unable to get my port forwarding working for external WAN access via SSH. 1 instead of the generic 0. Apr 2, 2016 · I have a Raspberry pi and I would like open a TCP port on it for example port : 11000 I tried to find a command in the internet for doing this but I could not. 3 on another Raspberry Pi everything goes all right (note the different netstat results): luis@Zarzaparrillo:~$ vncserver -name Zarzaparrillo -geometry 1280x1024 -depth 16 New 'Zarzaparrillo' desktop is Zarzaparrillo:1 Starting applications specified in /home/luis/. By default, it's SUPPOSED to listed on both TCP and UDP port 5900. org on port 8080. Mar 29, 2020 · Hi, newbie here, this is my first question after only reading for a while. 4. For displays that don’t support HDMI, consider an adapter that translates display output from HDMI to a port supported by your display. vnc Jun 21, 2018 · I am not a network expert but I think the problem may be that OpenGDB is listening to ports 3333 and 4444 at the local loopback address 127. However, to answer your question you can see if the port is open and what process is listening with the following command: Raspberry Pi Open Port 443: A Guide The Raspberry Pi is a popular single-board computer that can be used for a variety of projects, from simple IoT devices to complex robotics systems. Is there a known solution? Any advice would be appreciated. Couldn’t get to a specific workstation. I can connect to the Raspberry Pi desktop via Real VNC Viewer and open the web site in the Chromium browser there so I know it is up and running. Something odd about the way the packets are coming in? Are they definitely UDP and hitting the interface and port that you are listening on? Dec 13, 2015 · I've attempted a few projects now with the raspberry pi. The port numbers area available for both TCP and UDP, and when referred to in conjunction with the IP address it specifies the "socket". check your /etc/ssh/ssh_config file to see what port the ssh server in the pi is configured to as this is not always port #22. You've got the right IP but sshd isn't listening on port 22 3. Apr 18, 2015 · I have a serial device (an old computer that output via 9 pin connector), I can use a serial to usb to connect the device at 19200 baud with my windows PC no problem using something like cyberduck, to send data. When SSH is not working on a Raspberry Pi, it’s not just an inconvenience; it can bring an entire project to a grinding halt. Serial1 on the Due uses pins 19 (RX), 18 (TX). Zero. I Jul 16, 2013 · Here is what I would do. Aug 8, 2012 · Re: Checking port status Wed Aug 08, 2012 4:12 pm Ah, does this mean it is only listening on localhost: Code: Select all pi@raspberrypi ~ $ sudo netstat -pant | grep 2947 tcp 0 0 127. Sep 8, 2022 · The port on which VNC Server is expecting to receive direct connections is in use by another program or service. 3 V device, so voltages are okay. Feb 27, 2024 · By default, RealVNC Server remotes the graphical desktop running on your Raspberry Pi. Apr 10, 2014 · Is Openvpn configured to listen on 1194 udp Sun Oct 16, 2016 6:26 am Oct 31, 2022 · In wireshark I can see that both packets (from PC and then from sensor) arrive in RPi in the same way, but the one is successfully printed but the other is not. We can VNC to the server, but then from that server we cannot VNC into any of the computers that are in the same physical location. I want to make a simple IoT project, but I can't reach the pi via ssh, nor can I ping the (public) IP of the pi (I'm going to use DynDNS). 11 (build date Mon, 20 Feb 2017 22:47:27 +0000) starting 1488655160: Using default config. Requirements for relay mode If a peer-to-peer connection can not be established, Raspberry PI Connect will fall back to relay mode. I’ve been at this for a few days and my brain is dissolving. Forwarding to internal port 80, as you set as the binding port in the socket server. 5. The client (running on windows) suddenly froze, lik Nov 28, 2017 · Can I check on a Windows PC whether the port on my Raspberry (zero W) is accessible? I have tried Currports, but I cannot find how to use thissoftware to check the open ports of a remote device. The flagship Raspberry Pi series offers high-performance hardware, a full Linux operating system, and a variety of common ports in a form factor roughly the size of a credit card. 0. Both of these services are working fine without any problems. It is a value from 0 to 65535. I start GPSD manually (background daemon stopped) with: Imma try xfce4 I installed debian and xfce4 and it still doesn't work Imma try installing the ssh I am still getting the "The port on which the computer is listening could not be contacted. Does this port need to be open to run the program from the Net (WAN) please? Why is it closed? How the heck can I force it to open? Is the modem router defective? Sorry May 30, 2025 · The ability to securely shell into a Pi, often without a monitor, keyboard, or mouse attached (a “headless” setup), is what truly unlocks its potential for professional and semi-professional applications. run (host=’127. Dec 20, 2021 · 1640024891: Opening ipv4 listen socket on port 1883. Any ideas? Jan 3, 2013 · Check your Pi's IP address and enter your user name (Pi or whatever), then select Edit and enter you password, then save, then connect. Initially I thought VNC, then found out it doesn't work on bookworm, need to use TigerVNC instead. UFW should restrict the port access to a specific network (your local LAN) or even better a given IP address. What am I doing wrong? Many thanks, Oct 9, 2012 · Default configuration of VNC Server as built in to Raspberry Pi OS newly installed on a Pi 4. vmihhzi kin kgo lije dddyps wtye newe nlxpaxf uund xldqnm fcyvsj dplu jstq zbykgy nmsac