vnc port forwarding

Knute Johnson groups at knutejohnson.com
Wed Nov 3 00:08:10 UTC 2021


Make sure you only have one instance of TightVNC running.  I see two 
ports in your post, 5901 and 6001.  In the startup for TightVNC there 
should be an option to set the port -rfbport:5900 (the documentation is 
fragmented and sparse).  Sometimes port numbers change with the display 
number on systems that have virtual displays.

I usually use x11vnc just because that is the one I usually use.  It 
always uses port 5900.  Your client software should be able to select 
the port as well.

vncviewer
Section: TightVNC (1)
Updated: August 2006
Index Return to Main Contents

NAME
vncviewer - an X viewer client for VNC
SYNOPSIS
vncviewer [options] [host][:display]
vncviewer [options] [host][::port]
vncviewer [options] -listen [display]
vncviewer -help

Read more at: https://www.commandlinux.com/man-page/man1/vncviewer.1.html

Again, I would run ps -e | grep vnc to check to see how many VNC servers 
are running.



On 11/2/21 18:42, Zahid Rahman wrote:
> I can see the issue.!!!!
> Thanks for your time and patients.
> I followed the instructions here .
> https://www.smarthomebeginner.com/setup-vnc-server-on-ubuntu-linux/ 
> <https://www.smarthomebeginner.com/setup-vnc-server-on-ubuntu-linux/>
> 
> The vnc port always defaults to 5901.
> 
> How can  I get  it to default to 5900 ?
> 
> 
> 
> 
> On Tue, 2 Nov 2021, 10:56 pm Zahid Rahman, <zahidr1000 at gmail.com 
> <mailto:zahidr1000 at gmail.com>> wrote:
> 
>     192.168.0.20:1 <http://192.168.0.20:1>  this works local
> 
>     vnc viewer
> 
>     51.77.xx.xx:1 this doesn't work. external ip
> 
>     On Tue, 2 Nov 2021, 10:48 pm Zahid Rahman, <zahidr1000 at gmail.com
>     <mailto:zahidr1000 at gmail.com>> wrote:
> 
>         sudo lsof -i:5901
>         COMMAND    PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
>         Xtightvnc 2686 ubuntu    3u  IPv4  42834      0t0  TCP *:5901
>         (LISTEN)
>         Xtightvnc 2686 ubuntu   22u  IPv4 275574      0t0  TCP
>         ubuntu:5901->192.168.0.27:53498 <http://192.168.0.27:53498>
>         (ESTABLISHED)
>         ubuntu at ubuntu:~$
> 
>         On Tue, 2 Nov 2021, 10:35 pm Zahid Rahman, <zahidr1000 at gmail.com
>         <mailto:zahidr1000 at gmail.com>> wrote:
> 
>             ubuntu at ubuntu:~$  ps -e | grep vnc
>                 2686 ?        00:01:21 Xtightvnc
>             ubuntu at ubuntu:~$  netstat -tulpn | grep LISTEN
>             (Not all processes could be identified, non-owned process info
>               will not be shown, you would have to be root to see it all.)
>             tcp        0      0 127.0.0.1:8009 <http://127.0.0.1:8009> 
>                      0.0.0.0:*               LISTEN      2813/java
>             tcp        0      0 0.0.0.0:139 <http://0.0.0.0:139>       
>                   0.0.0.0:*               LISTEN      -
>             tcp        0      0 0.0.0.0:5901 <http://0.0.0.0:5901>     
>                    0.0.0.0:*               LISTEN      2686/Xtightvnc
>             tcp        0      0 127.0.0.1:8080 <http://127.0.0.1:8080> 
>                      0.0.0.0:*               LISTEN      2813/java
>             tcp        0      0 0.0.0.0:6001 <http://0.0.0.0:6001>     
>                    0.0.0.0:*               LISTEN      2686/Xtightvnc
>             tcp        0      0 127.0.0.53:53 <http://127.0.0.53:53>   
>                     0.0.0.0:*               LISTEN      -
>             tcp        0      0 0.0.0.0:22 <http://0.0.0.0:22>         
>                  0.0.0.0:*               LISTEN      -
>             tcp        0      0 127.0.0.1:631 <http://127.0.0.1:631>   
>                     0.0.0.0:*               LISTEN      -
>             tcp        0      0 127.0.0.1:54200
>             <http://127.0.0.1:54200>         0.0.0.0:*             
>               LISTEN      2813/java
>             tcp        0      0 127.0.0.1:5432 <http://127.0.0.1:5432> 
>                      0.0.0.0:*               LISTEN      -
>             tcp        0      0 127.0.0.1:8443 <http://127.0.0.1:8443> 
>                      0.0.0.0:*               LISTEN      2813/java
>             tcp        0      0 0.0.0.0:445 <http://0.0.0.0:445>       
>                   0.0.0.0:*               LISTEN      -
>             tcp        0      0 127.0.0.1:9990 <http://127.0.0.1:9990> 
>                      0.0.0.0:*               LISTEN      2813/java
>             tcp6       0      0 :::139                  :::*           
>                      LISTEN      -
>             tcp6       0      0 :::80                   :::*           
>                      LISTEN      -
>             tcp6       0      0 :::22                   :::*           
>                      LISTEN      -
>             tcp6       0      0 ::1:631                 :::*           
>                      LISTEN      -
>             tcp6       0      0 :::443                  :::*           
>                      LISTEN      -
>             tcp6       0      0 :::445                  :::*           
>                      LISTEN      -
> 
>             On Tue, 2 Nov 2021, 9:53 pm Knute Johnson,
>             <groups at knutejohnson.com <mailto:groups at knutejohnson.com>>
>             wrote:
> 
>                 On 11/2/21 12:10, Colin Law wrote:
> 
>                  > Also *please* do as I asked earlier, and on the
>                 machine running vnc run
>                  > sudo lsof -i:5900
>                  >
>                  > Colin
>                  >
> 
>                 Just so you don't think you are the only one, I don't
>                 think there is any
>                 VNC server running on his computer either .
> 
>                 Zahid, this is what you should get:
> 
>                 knute at knute-XPS-8700:~$ ps -e | grep vnc
>                      2566 ?        00:00:00 x11vnc
> 
>                 knute at knute-XPS-8700:~$ netstat -tulpn | grep LISTEN
>                 (Not all processes could be identified, non-owned
>                 process info
>                    will not be shown, you would have to be root to see
>                 it all.)
>                 tcp        0      0 127.0.0.53:53
>                 <http://127.0.0.53:53>           0.0.0.0:* LISTEN      -
>                 tcp        0      0 0.0.0.0:22 <http://0.0.0.0:22>     
>                          0.0.0.0:* LISTEN      -
>                 tcp        0      0 127.0.0.1:631
>                 <http://127.0.0.1:631>           0.0.0.0:* LISTEN      -
>                 tcp        0      0 0.0.0.0:5900 <http://0.0.0.0:5900> 
>                            0.0.0.0:* LISTEN
>                 2566/x11vnc
>                 tcp6       0      0 :::22                   :::* LISTEN 
>                      -
>                 tcp6       0      0 ::1:631                 :::* LISTEN 
>                      -
>                 tcp6       0      0 :::5900                 :::* LISTEN 
>                      2566/x11vnc
> 
>                 knute at knute-XPS-8700:~$ sudo lsof -i:5900
>                 COMMAND  PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
>                 x11vnc  2566 knute    8u  IPv4  34352      0t0  TCP
>                 *:5900 (LISTEN)
>                 x11vnc  2566 knute    9u  IPv6  34353      0t0  TCP
>                 *:5900 (LISTEN)
> 
> 
>                 -- 
> 
>                 Knute Johnson
> 
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> 


-- 

Knute Johnson




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