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vnc service
# https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-vnc-remote-access-for-the-gnome-desktop-on-centos-7#step-4-%E2%80%94-configuring-vnc-service-for-two-clients
systemctl status vncserver@:.service
systemctl is-enabled vncserver@.service
systemctl enable vncserver@:.service
systemctl is-enabled vncserver@.service
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caot commented Mar 12, 2021 •
edited

How to specify to MSTSC which session to connect to?

Configuring VNC Service for Two Clients

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caot commented Mar 25, 2022 •
edited

Sharing an Existing Desktop https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/deployment_guide/sec-vnc-sharing-an-existing-desktop

By default a logged in user has a desktop provided by X Server on display 0. A user can share their desktop using the TigerVNC server x0vncserver.

Procedure 15.5. Sharing an X Desktop
To share the desktop of a logged in user, using the x0vncserver, proceed as follows:

Enter the following command as root

~]# yum install tigervnc-server

Set the VNC password for the user:

~]$ vncpasswd
Password:
Verify:

Enter the following command as that user:

~]$ x0vncserver -PasswordFile=.vnc/passwd -AlwaysShared=1

Provided the firewall is configured to allow connections to port 5900, the remote viewer can now connect to display 0, and view the logged in users desktop. See Section 15.3.2.1, “Configuring the Firewall for VNC” for information on how to configure the firewall.

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caot commented Mar 25, 2022 

[system]$ pwd
/lib/systemd/system
[system]$ ls -lrt | grep -E 'vnc|xrdp'
-rw-r--r--  1 root root  416 Mar 11  2020 xrdp-sesman.service
-rw-r--r--  1 root root  263 Mar 11  2020 xrdp.service
-rw-r--r--  1 root root  105 Apr  1  2020 xvnc.socket
-rw-r--r--  1 root root 1419 Apr  1  2020 xvnc@.service
-rw-r--r--  1 root root 1707 Apr  1  2020 vncserver@.service
[system]$ 
[system]$ 
[system]$ 
[system]$ systemctl status xvnc.socket
● xvnc.socket - XVNC Server
   Loaded: loaded (/usr/lib/systemd/system/xvnc.socket; disabled; vendor preset: disabled)
   Active: inactive (dead)
   Listen: [::]:5900 (Stream)
 Accepted: 0; Connected: 0
[system]$ systemctl status xvnc@.service
Failed to get properties: Unit name xvnc@.service is missing the instance name.
[system]$ systemctl status vncserver@.service
Failed to get properties: Unit name vncserver@.service is missing the instance name.
[system]$ 
[system]$ 
[system]$ systemctl status xrdp-sesman.service
● xrdp-sesman.service - xrdp session manager
   Loaded: loaded (/usr/lib/systemd/system/xrdp-sesman.service; disabled; vendor preset: disabled)
   Active: active (running) since Fri 2022-03-11 09:21:34 EST; 2 weeks 0 days ago
     Docs: man:xrdp-sesman(8)
           man:sesman.ini(5)
 Main PID: 1734 (xrdp-sesman)
    Tasks: 1
   CGroup: /system.slice/xrdp-sesman.service
           └─1734 /usr/sbin/xrdp-sesman --nodaemon

Mar 25 12:50:34 localhost xrdp-sesman[1734]: [3254528898]: CLIPBOARD  clipboard_event_selection_notify: 1954 : ERROR: clipboard_event_selection_notify: unknown atom 0x1cd
Mar 25 12:50:34 localhost xrdp-sesman[1734]: [3254539537]: CLIPBOARD  clipboard_event_selection_notify: 1954 : ERROR: clipboard_event_selection_notify: unknown atom 0x48
Mar 25 12:50:34 localhost xrdp-sesman[1734]: [3254539537]: CLIPBOARD  clipboard_event_selection_notify: 1954 : ERROR: clipboard_event_selection_notify: unknown atom 0x47
Mar 25 12:50:34 localhost xrdp-sesman[1734]: [3254539537]: CLIPBOARD  clipboard_event_selection_notify: 1954 : ERROR: clipboard_event_selection_notify: unknown atom 0xfd
Mar 25 12:50:34 localhost xrdp-sesman[1734]: [3254539537]: CLIPBOARD  clipboard_event_selection_notify: 1954 : ERROR: clipboard_event_selection_notify: unknown atom 0x1bb
Mar 25 12:50:34 localhost xrdp-sesman[1734]: [3254539537]: CLIPBOARD  clipboard_event_selection_notify: 1954 : ERROR: clipboard_event_selection_notify: unknown atom 0x1cb
Mar 25 12:50:34 localhost xrdp-sesman[1734]: [3254539537]: CLIPBOARD  clipboard_event_selection_notify: 1954 : ERROR: clipboard_event_selection_notify: unknown atom 0x49
Mar 25 12:50:34 localhost xrdp-sesman[1734]: [3254539537]: CLIPBOARD  clipboard_event_selection_notify: 1954 : ERROR: clipboard_event_selection_notify: unknown atom 0x1cc
Mar 25 12:50:34 localhost xrdp-sesman[1734]: [3254539537]: CLIPBOARD  clipboard_event_selection_notify: 1954 : ERROR: clipboard_event_selection_notify: unknown atom 0x1cd
Mar 25 12:50:34 localhost xrdp-sesman[1734]: [3254559846]: CLIPBOARD  clipboard_event_selection_notify: 1954 : ERROR: clipboard_event_selection_notify: unknown atom 0x48
[system]$ 
[system]$ systemctl status xrdp.service
● xrdp.service - xrdp daemon
   Loaded: loaded (/usr/lib/systemd/system/xrdp.service; enabled; vendor preset: disabled)
   Active: active (running) since Fri 2022-03-11 09:21:34 EST; 2 weeks 0 days ago
     Docs: man:xrdp(8)
           man:xrdp.ini(5)
 Main PID: 1735 (xrdp)
    Tasks: 2
   CGroup: /system.slice/xrdp.service
           ├─ 1735 /usr/sbin/xrdp --nodaemon
           └─12068 /usr/sbin/xrdp --nodaemon

Mar 25 12:50:13 localhost xrdp[1735]: [20220325-12:49:48] [DEBUG] VNC got clip data
Mar 25 12:50:13 localhost xrdp[1735]: [20220325-12:49:50] [DEBUG] VNC got clip data
Mar 25 12:50:13 localhost xrdp[1735]: [20220325-12:50:01] [DEBUG] VNC got clip data
Mar 25 12:50:13 localhost xrdp[1735]: [20220325-12:50:03] [DEBUG] VNC got clip data
Mar 25 12:50:13 localhost xrdp[1735]: [20220325-12:50:12] [DEBUG] VNC got clip data
Mar 25 12:50:29 localhost xrdp[12068]: (12068)(140235178351040)[DEBUG] VNC got clip data
Mar 25 12:50:33 localhost xrdp[12068]: (12068)(140235178351040)[DEBUG] VNC got clip data
Mar 25 12:50:34 localhost xrdp[12068]: (12068)(140235178351040)[DEBUG] VNC got clip data
Mar 25 12:50:44 localhost xrdp[12068]: (12068)(140235178351040)[DEBUG] VNC got clip data
Mar 25 12:50:45 localhost xrdp[12068]: (12068)(140235178351040)[DEBUG] VNC got clip data

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caot commented Mar 23, 2023

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_guide/ch-tigervnc

vncviewer localhost:5950

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