Subj : Re: emacs: Cannot connect to X server :0.0
To   : comp.os.linux
From : Thomas D. Shepard
Date : Fri Jul 30 2004 05:56 pm

On Fri, 30 Jul 2004 11:27:08 -0700, wendy wrote:

There is not enough information here to unambiguously resolve your
problem. But I'll try anyway.

The most frequent case where I encounter this error is when I attempt to
start up emacs and am logged in as a user other than the user who owns the
display. For example, I am logged in and need to run emacs as root to
perform maintenance. So my session looks like this

thomas[1] su -
password: ********
root[1] emacs &
Xlib: connection to ":0.0" refused by server
root[2] xhost +
access control disabled, clients can connect from any host
root[3] emacs &
(now it works)

Note that xhost + is a very insecure way to fix this problem. Since I am
behind a firewall that I personally configured and tested, it is ok for
me. But you may want to issue a more restrictive xhost command, to allow
connections from localhost. Check the xhost man page.

Unless you have some special reason like the preceding, you should just
make sure the X-Windows session was started under your username.

There are lots of other things that can cause this too.

X probably logs messages to a file called ".xsession-errors" in your home
directory (the home directory of whoever is really running the x session).
That would be a good place to look for more clues on what is wrong.

> I have a newbie problem on emacs also, in fact all the X window program.
> 
> When I want to use emacs to edit the existing file,  I got the following error:
> -----------------------------------------------
> Xlib: connection to ":0.0" refused by server
> Xlib: No protocol specified
>  
> emacs: Cannot connect to X server :0.0.
> Check the DISPLAY environment variable or use `-d'.
> Also use the `xhost' program to verify that it is set to permit
> connections from your machine.
> -----------------------------------------------
> I can just open files with emacs one hour ago without doing anything.
> Can someone help me with this? 
> 
> Thanks
> Wendy

-- 
Thomas D. Shepard
Sorry, you can't email me.
(Email address is fake.)

.