xrdp-sesman fails to start X-server; How to find the cause / not unlikely permission problem! How to analyze / how to fix?

I am trying to get xrdp working for day's which works it the user is ^root^ but not in case I use xrdp in combination with some other user. That raises the verdict that there is an authorization problem. Below some lines which shows that ^xrdp-sesman^ tries to start a x-server session, with:
- works if the user is root and
- fails for any other user

User is ROOT
18:38:45.000 xrdp[1018]: 6 xrdp[1018]: [INFO ] connected ok
18:38:45.000 xrdp[1018]: 6 xrdp[1018]: [INFO ] lib_mod_log_peer: xrdp_pid=1018 connected to X11rdp_pid=0 X11rdp_uid=7125 X11rdp_gid=0 client_ip=192.168.17.34 client_port=3667

Some Other user
17:03:54.000 xrdp-sesman[953]: 4 xrdp-sesman[953]: [WARN ] Timed out waiting for X server on display 13 to startup

xrdp-sesman trying to start x-server
17:03:43.000 xrdp-sesman[955]: 6 xrdp-sesman[955]: [INFO ] Starting X server on display 13: /usr/local/libexec/Xorg :13 -auth .Xauthority -config xrdp/xorg.conf -noreset -nolisten tcp

As said this raises the verdict that there is an autorisation problem (I can not exclude another issue).

- I would like to raise xrdp-sesman permissions, to check if my idea that it is a permission issue is correct. However no idea how to do that
- any other help to analyse or fix this would of course be appriciated

Note:
I am running an FreeNAS14 VM, having the very latest patches
 
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