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I tried to activate the vnc service but it does not work for unknown reason. I tried two clients without success. The service is running for sure and a desktop is started in the pi. I try to connect with following address pi0002:1 or pi0002:0. Below is the status of the service and its output when connecting.

systemctl status vncserver-x11-serviced.service

   Loaded: loaded (/usr/lib/systemd/system/vncserver-x11-serviced.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2017-09-26 13:52:45 CEST; 9min ago
 Main PID: 458 (vncserver-x11-s)
   CGroup: /system.slice/vncserver-x11-serviced.service
           ├─458 /usr/bin/vncserver-x11-serviced -fg
           ├─480 /usr/bin/vncserver-x11-core -service
           ├─504 /usr/bin/vncagent service 14
           ├─704 /usr/bin/vncserverui service 15
           └─730 /usr/bin/vncserverui -statusicon 7

Sep 26 13:52:46 pi0002 vncserver-x11[480]: AgentInitCheck: agent comms failure
Sep 26 13:52:46 pi0002 vncserver-x11[480]: ConsoleDisplay: Found running X server (pid=489)
Sep 26 13:53:00 pi0002 vncserver-x11[480]: Connections: connected: 192.168.188.83::40828
Sep 26 13:53:00 pi0002 vncserver-x11[480]: Connections: disconnected: 192.168.188.83::40828 ([EndOfStream] Disconnection by client)
Sep 26 13:55:38 pi0002 vncserver-x11[480]: Connections: connected: 192.168.188.83::40994
Sep 26 13:55:38 pi0002 vncserver-x11[480]: Connections: disconnected: 192.168.188.83::40994 ([EndOfStream] Disconnection by client)
Sep 26 13:56:22 pi0002 vncserver-x11[480]: Connections: connected: 10.1.2.10::46034
Sep 26 13:56:22 pi0002 vncserver-x11[480]: Connections: disconnected: 10.1.2.10::46034 ([EndOfStream] Disconnection by client)
Sep 26 13:57:32 pi0002 vncserver-x11[480]: Connections: connected: 192.168.188.83::41378
Sep 26 13:57:32 pi0002 vncserver-x11[480]: Connections: disconnected: 192.168.188.83::41378 ([EndOfStream] Disconnection by client)
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    I am getting a similar problem on stretch, including the agent comms failure message, but the additional message I see coming from vncserver-x11-serviced is [unable to open display ""] (without the brackets)
    – Rebroad
    Commented Mar 20, 2018 at 0:53
  • What are you using for a VNC client? What are the IP addresses of the Pi and the machine running the client. (Please edit this information into your question rather than responding in a comment.)
    – Bob Brown
    Commented Mar 22, 2020 at 15:17
  • Not sure if this is the issue but RealVNC have downgraded the IOS application but there is not a full explanation on the App Store and I could see nothing in their blog either.
    – user115418
    Commented Apr 21, 2020 at 15:30

1 Answer 1

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According to the manual https://www.raspberrypi.org/documentation/remote-access/vnc/ you need 

On the device you'll use to take control, download VNC Viewer. For best results, use the compatible app from RealVNC.

Once you download and install the compatible app from https://www.realvnc.com/en/connect/download/viewer/ , enter the user name and password you normally use to log in to your user account on the Raspberry Pi. By default, these credentials are pi and raspberry.

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  • This is a Pi-side issue, and not a problem with the device which he is using to take control.
    – user96931
    Commented Mar 23, 2020 at 18:29
  • As he stated, the service is enabled and running. The problem is connection from remote, where he stated that using 2 different clients it gives a connection error. The client that works is the compatible one from the realvnc, as described in the manual. I had exactly the same problem.
    – Hristo
    Commented Mar 30, 2020 at 13:48

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