maybe this is the reason ?
gedit /root/.vnc/zi-desktop:1.log
Crash Annotation GraphicsCriticalError: |[0][GFX1-]: glxtest: libEGL no display (t=2.56709) [GFX1-]: glxtest: libEGL no display
Crash Annotation GraphicsCriticalError: |[0][GFX1-]: glxtest: libEGL no display (t=2.56709) |[1][GFX1-]: glxtest: libEGL no display (t=2.56728) [GFX1-]: glxtest: libEGL no display
OR
11/07/2021 11:18:15 Got connection from client 192.168.1.6
11/07/2021 11:18:15 Using protocol version 3.8
11/07/2021 11:18:15 Full-control authentication enabled for 192.168.1.6
11/07/2021 11:18:15 rfbProcessClientNormalMessage: ignoring unknown encoding 24 (18)
11/07/2021 11:18:15 Using ZRLE encoding for client 192.168.1.6
11/07/2021 11:18:15 rfbProcessClientNormalMessage: ignoring unknown encoding 22 (16)
11/07/2021 11:18:15 rfbProcessClientNormalMessage: ignoring unknown encoding 21 (15)
11/07/2021 11:18:15 rfbProcessClientNormalMessage: ignoring unknown encoding 15 (f)
11/07/2021 11:18:15 rfbProcessClientNormalMessage: ignoring unknown encoding -314 (fffffec6)
11/07/2021 11:18:15 Enabling full-color cursor updates for client 192.168.1.6
11/07/2021 11:18:15 Enabling Desktop Size protocol extension for client 192.168.1.6
11/07/2021 11:18:15 Pixel format for client 192.168.1.6:
11/07/2021 11:18:15 8 bpp, depth 6
11/07/2021 11:18:15 true colour: max r 3 g 3 b 3, shift r 4 g 2 b 0
11/07/2021 11:18:15 Pixel format for client 192.168.1.6:
11/07/2021 11:18:15 16 bpp, depth 16, little endian
11/07/2021 11:18:15 true colour: max r 31 g 63 b 31, shift r 11 g 5 b 0
11/07/2021 11:18:15 no translation needed
11/07/2021 11:18:15 rfbProcessClientNormalMessage: ignoring unknown encoding 24 (18)
11/07/2021 11:18:15 rfbProcessClientNormalMessage: ignoring unknown encoding 15 (f)
11/07/2021 11:18:15 Using hextile encoding for client 192.168.1.6
11/07/2021 11:18:15 rfbProcessClientNormalMessage: ignoring unknown encoding 22 (16)
11/07/2021 11:18:15 rfbProcessClientNormalMessage: ignoring unknown encoding 21 (15)
11/07/2021 11:18:15 rfbProcessClientNormalMessage: ignoring unknown encoding -314 (fffffec6)
11/07/2021 11:18:15 Enabling full-color cursor updates for client 192.168.1.6
(mousepad:15145): Gtk-WARNING **: 11:18:44.986: Theme parsing error: :2:29: The style property GtkButton:default-border is deprecated and shouldn’t be used anymore. It will be removed in a future version
(mousepad:15145): Gtk-WARNING **: 11:18:44.986: Theme parsing error: :3:37: The style property GtkButton:default-outside-border is deprecated and shouldn’t be used anymore. It will be removed in a future version
(mousepad:15145): Gtk-WARNING **: 11:18:44.987: Theme parsing error: :4:27: The style property GtkButton:inner-border is deprecated and shouldn’t be used anymore. It will be removed in a future version
(mousepad:15145): Gtk-WARNING **: 11:18:44.987: Theme parsing error: :5:31: The style property GtkWidget:focus-line-width is deprecated and shouldn’t be used anymore. It will be removed in a future version
(mousepad:15145): Gtk-WARNING **: 11:18:44.987: Theme parsing error: :6:28: The style property GtkWidget:focus-padding is deprecated and shouldn’t be used anymore. It will be removed in a future version
Falling back to using screens root_visual.
kdeconnect.core: Broadcasting identity packet
kdeconnect.core: Starting client ssl (but I’m the server TCP socket)
kdeconnect.core: Socket succesfully stablished an SSL connection
kdeconnect.core: It is a new device “Z390-AORUS-PRO”
kdeconnect.core: Not loading plugin “kdeconnect_telephony” because device doesn’t support it
kdeconnect.core: Not loading plugin “kdeconnect_pausemusic” because device doesn’t support it
kdeconnect.core: Not loading plugin “kdeconnect_sftp” because device doesn’t support it
(nm-applet:7745): Gtk-CRITICAL **: 11:32:22.274: gtk_widget_destroy: assertion ‘GTK_IS_WIDGET (widget)’ failed
(nm-applet:7745): Gtk-CRITICAL **: 11:32:22.274: gtk_widget_destroy: assertion ‘GTK_IS_WIDGET (widget)’ failed
(nm-applet:7745): Gtk-WARNING **: 11:32:22.285: Can’t set a parent on widget which has a parent
(nm-applet:7745): Gtk-CRITICAL **: 11:36:53.555: gtk_widget_destroy: assertion ‘GTK_IS_WIDGET (widget)’ failed
(nm-applet:7745): Gtk-CRITICAL **: 11:36:53.555: gtk_widget_destroy: assertion ‘GTK_IS_WIDGET (widget)’ failed
(nm-applet:7745): Gtk-WARNING **: 11:36:53.563: Can’t set a parent on widget which has a parent
double free or corruption (!prev)
(EE)
Fatal server error:
(EE) Caught signal 6 (Aborted). Server aborting
(EE)
kdeconnect.core: TCP connection done (i’m the existing device)
kdeconnect.core: Starting server ssl (I’m the client TCP socket)
kdeconnect.core: Socket succesfully stablished an SSL connection
kdeconnect.core: It is a new device “Z390-AORUS-PRO”
kdeconnect.core: Not loading plugin “kdeconnect_telephony” because device doesn’t support it
kdeconnect.core: Not loading plugin “kdeconnect_pausemusic” because device doesn’t support it
kdeconnect.core: Not loading plugin “kdeconnect_sftp” because device doesn’t support it
kdeconnect.core: TCP connection done (i’m the existing device)
kdeconnect.core: Starting server ssl (I’m the client TCP socket)
kdeconnect.core: Socket succesfully stablished an SSL connection
kdeconnect.core: It is a new device “Z390-AORUS-PRO”
kdeconnect.core: Not loading plugin “kdeconnect_telephony” because device doesn’t support it
kdeconnect.core: Not loading plugin “kdeconnect_pausemusic” because device doesn’t support it
kdeconnect.core: Not loading plugin “kdeconnect_sftp” because device doesn’t support it