[newbie] X problems

[Michael Dolan]

hi i was wanting to know what file i have to edit for this problem i
have
each time i start any program from console i get this message

Xlib: connection to ":0.0" refused by server
Xlib: Client is not authorized to connect to Server

GtK-WARNING **: cannot open display: :0

i know how to fix this by typing in xhost +localhost

but i have to this each time start a new X session so does anyone know
what file i have to edit to fix this???