VNC display error (Red Hat 7.3 gnome session)

Hi all,
I found a problem accesing via VNC to my laptop (Reh Hat 7.3), a grey screen appears it says “Something goes wrong”.

VNC error log:
vncext: VNC extension running!
vncext: Listening for VNC connections on all interface(s), port 5956
vncext: created VNC server for screen 0
gnome-session-is-accelerated: No hardware 3D support.
gnome-session-check-accelerated: Helper exited with code 256
gnome-session-is-accelerated: No hardware 3D support.
gnome-session-check-accelerated: Helper exited with code 256

same error at start a gnome session remotely via MobaXterm:

/home/spsy> gnome-session
** (gnome-session-check-accelerated:2514): WARNING **: Couldn’t connect to accessibility bus: Failed to connect to socket /tmp/dbus-i0UH82cqlq: Connection refused
gnome-session-is-accelerated: No hardware 3D support.
gnome-session-check-accelerated: Helper exited with code 256

** (gnome-session-check-accelerated:2523): WARNING **: Couldn’t connect to accessibility bus: Failed to connect to socket /tmp/dbus-i0UH82cqlq: Connection refused

gnome-session-is-accelerated: No hardware 3D support.
gnome-session-check-accelerated: Helper exited with code 256
** (process:2506): WARNING **: software acceleration check failed: Child process exited with code 1

Glx execution fails too:
ad1mpana#spsy|/home/spsy> glxinfo
name of display: localhost:11.0
Error: couldn’t find RGB GLX visual or fbconfig

ad1mpana#spsy|/home/spsy> glxgears
Error: couldn’t get an RGB, Double-buffered visual

any idea?
my laptop has 1 Nvidia Card:
/home/spsy> lspci -nn | grep VGA
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GK104GLM [Quadro K3100M] [10de:11b6] (rev a1)

The xvnc server is not accelerated, so this won’t run. Either run a real X server and use x11vnc to connect or do a setup with virtualgl.