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Open a window on a remote X display (why “Cannot open display”)?

I have a script that when run independently works that needs X11 Display variables to be set. When I invoke this script using a background daemon job, I get the following error.
Xlib: connection to "localhost.localdomain:0.0" refused by server
Xlib: No protocol specified
Please help me identifying the possible mistake that I have in this.
Commands given below which is inside the script.
export DISPLAY=hostname:0.0
java ScreenCapture
If the same script is invoked by a background daemon running as a service, I get the error.

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marked as duplicate by Gilles, Renan, jasonwryan, warl0ck, Mat Oct 7 '12 at 6:43

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1 Answer

I'm just guessing here, but the background daemon might be running as different user, which does not have permission to access the display.

You can use xhost to control user access:

The xhost program is used to add and delete host names or user names to the list allowed to make connections to the X server.

You can test if this is the problem by running:

xhost +

from a terminal window, which will allow any user to access the display.

xhost +(insert username here)

will allow access for a specific user.

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