问题
I am currently using X11RDP to connect to a RHEL 6.5 endpoint, as root user. All X apps work fine, and directed properly to the right display (say 11.0).
Now if I switch to another user (su - user1), then I try to open any X app (say xterm) it will be unable to open the display (even though it is also 11.0).
I do not believe the problem to be with xauth (magic cookies, etc), or the DISPLAY environment variable not being set correctly, or allowing connection with xhost +; but rather something with XRDP.
Any help would be appreciated.
回答1:
The solution to my problem was actually in how x11rdp was starting.
It starts the x server with -nolisten tcp.
If that part is commented out in /etc/xrdp/sesman.ini for x11rdp then the problems described above will be gone.
Hope this helps other people experiencing the same problems.
来源：https://stackoverflow.com/questions/30063218/cannot-open-display-while-running-x-apps-as-another-user