changing user with SU, gives "Xlib: connection to ":0.0" refused by server"

[Rick Knight]

Mario Vukelic wrote:
> On Mon, 2007-10-08 at 13:01 -0300, Derek Broughton wrote:
>   
>> otoh, I routinely use sudo, get those messages, and apps still work as
>> expected anyway!
>>     
>
> You were lucky. Using sudo for X apps can be bad, something with
> permissions in /var/temp or /var/lock or similar. It can prevent
> non-root users from starting the app.
>
> https://help.ubuntu.com/community/RootSudo#head-0c932eb3f1619126fc8307ee7690f462552d34ec
>
>
>   
This is true. I only use this on cli apps and when building a new kernel 
and running "make xconfig". I've in the past used it with kate and was 
unable to launch kate as a normal user afterward. This was easy to fix 
by deleting the rc file for kate, but this is a potential problem with 
using xhost.

Rick