I can not connect mi Pi through vnc

[ancris00]

Hi all,
thanks in advance.
I have just bought mi pi 4 and set SO raspbian buster.
I give the comands through Putty
I have set up vnc in mi pc
When I try to connect a Windows comes up "The name of the user it is not recognize or the password is incorret"
How can I solve it?
Thanks

[pcmanbob]

Hi.

So when you get to this screen on VNC viewer



you need to change the user name to pi

then in the password field you enter your pi password , if you have not changed it then it will be raspberry, if you have changed it then use what ever you changed it to.

[ancris00]

Hi pcmanbob,
thanks for your time
When I got my Pi4 I hadn´t a usb keyboard (but yes usb-mouse), so when I installed Raspbian Buster with desktop I just clic "continue, continue..."
The user name "pi" was already written so good, but the fied "password" was empty and of course I clic continue...
Throug the router I got the ip: 192.168.0.20
On Putty to enter in the pi I had to put user:pi and password:raspberry (and was ok)
Later I put: sudo apt-get update
sudo apt-get upgrate (I gave some advice about the vlc (media player...)). I hope the upgrate was good but I dont know
sudo apt-get install-y realvnc-vnc-server realvnc-vnc-viewer (later I read on internet that Raspbien comes with vnc already installed so I think I did this step vanish (not needed it)
sudo vncserver (to activated vncserver)
and vncserver reply pi on 192.168.0.20:1
On my laptop I clic on vncviewer, put user:pi and password: raspberry and it is when I had this message "The name of the user it is not recognize or the password is incorret"
What I did wrong?
Because I try try try and nothing I put sudo apt-get install xrdp
and now I connect to my pi through remote desk of Windows on my laptop
But still I can not connect through vnc
Pleae tell me all the things that I did wrong I want to learn
Thanks

[klricks]

Do not use sudo with vncserver.

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vncserver

[pcmanbob]

You are obviously following an old set of instructions on how to run realvnc.

It is installed by default now on raspbian buster , you only have to enable it via

sudo raspi-config

If you look under interfacing options you will find enable VNC.

You can do this via an SSH connection of raspbian on you SD card.

By attempting to install it and run it using sudo you may have corrupted things ,

So you may need to start over with a fresh install.

If you intend to run you pi without a screen connected you will also need to set a default resolution
That your pi will use when the screen is not connected you will find this under
Advanced options in the raspi-config menu.

[ancris00]

Hi pcmanbob,
your were absolutelly right.
I got install again new raspbian bluster 4.16
Then in Pi4, confPi, clic on vnc on
Then on the terminal: vncviewer
Then from my laptop using vnc viewer 19.168.0.22:1 and buala
Now, just to make it perfet, how must I do it in order not to have to write vncviewer each time that I swicth on the Pi4?
Thanks

[pcmanbob]

Why are you running vncviewer on the pi ?

You normally run that on the pc that you want to use to view the pi desktop, you would not run it on the pi unless you are using one pi to view another pi's desktop.

[ancris00]

sorry I meant vncserver

[pcmanbob]

If you just enable VNC from raspi-config then it will be run automatically every time your pi boots, no need to run it from the command line.

see my previous post

[ancris00]

Hi pcmanbob,
thanks for your time
I had activated vnc from Piconfig but still does not work
I have to actívate through Putty

[pcmanbob]

Well this is telling you its enabled.



the second and third lines are giving you the identification phrase so you know you have the correct VNC connection when you log on and the last line is giving you the IP address of the server that you need to input in the VNC viewer to connect to the pi in question.

[ancris00]

Maybe I have not explain myself correctly
Each time that I switch off Pi I have to actívate again vncserver throught Putty
Is there something to program that activation each time I switch on the Pi?

[pcmanbob]

Maybe I have not explain myself correctly
Each time that I switch off Pi I have to actívate again vncserver throught Putty
Is there something to program that activation each time I switch on the Pi?

That should not happen

Has your SD card gone read only ?

you can test this via putty.

once you have signed in via putty, enter this command

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ls

you should see a list of directories and files

now enter this command

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touch check.txt

now do this command again to see the list of files

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ls

can you see the file we just created ?
if so reboot your pi with

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sudo reboot

once you pi reboots and you log back in,
now enter this command again

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ls

can you still see the file you just created called check.txt

[ancris00]

yes

[pcmanbob]

So you SC card has not gone read only, but I still don't understand why you need to re-enable VNC after each reboot.

next time you boot and use sudo raspi-config to re-enable VNC , just check that its not already showing as active ( activo ).

[klricks]

There are 2 modes for RealVNC...... Service Mode and Virtual mode.
The modes are really 2 different things and should not be confused.
Most users will use Service Mode.

Service Mode:
- VNC must be enabled via raspi-config or GUI config tool.
- When enabled, automatically runs at startup.
- Boot to desktop is required.
- If no HDMI monitor then need to set a fixed resolution using sudo raspi-config.
- Mirrors the local desktop session (One session only).

Virtual Mode: (vncserver)
- No enable setting required. (The VNC config setting is for Service Mode only).
- Boot to desktop not required but desktop must be installed to the OS.
- Does not autostart by default* (Must type vncserver at local command line or via ssh each time)
- Does not show the local desktop session.
- Can have multiple independent sessions running. ip:1, ip:2 ..... etc.
- It is possible to run a Service Mode session and any number of Virtual Mode sessions concurrently.

*Virtual mode can be made to autostart by adding this to /etc/rc.local:

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sudo -u pi vncserver &

[ancris00]

Thank you klricks,
Service mode:
-as no Hdmi contected to Pi I set a fixed resolution
-reboot
-no conection

Virtual mode:
-as I want I tried to write the code /etc/rc.local and was no posible

[ancris00]

Anybody can help me?

[pcmanbob]

I don't understand why you can't enable VNC from raspi-config with a default resolution set and have it available on every boot I and many other people are doing it that way.

As for enabling virtual mode via rc.local, you need to use sudo to edit rc.local and you don't need to put sudo at the start of the line in rc.local as its already running as root.

When your first started all this you had tried to install VNC when it was already installed and I suggested you start over with a fresh install of raspbian on your SD card, did you do this ?

[ancris00]

I don't understand why you can't enable VNC from raspi-config with a default resolution set and have it available on every boot I and many other people are doing it that way.

When you said boot, do you mean switch off and switch off?I write just in case the Raspberry behaves differently

When your first started all this you had tried to install VNC when it was already installed and I suggested you start over with a fresh install of raspbian on your SD card, did you do this ?

Yes I did a new install

[ancris00]

Hi pcmanbob, hi klricks,
finally I attached or conected a screen to my pi
Then I could modify/edit file rc.local
So now I can conect my pi thought vnc without write vncserver thorough ssh (Putty) each reboot. (Just Virtual mode)
But this error comes up (see picture)
Do you know what does it mean?
Thanks

[klricks]

Hi pcmanbob, hi klricks,
finally I attached or conected a screen to my pi
Then I could modify/edit file rc.local
So now I can conect my pi thought vnc without write vncserver thorough ssh (Putty) each reboot. (Just Virtual mode)
But this error comes up (see picture)
Do you know what does it mean?
Thanks

I get the same error when I tried it. I just ignored it and all seemed to work fine, though I only briefly tried it as I noramaly use Service mode.
You might want to ask in the RealVNC web site /forums.