Bug 235175 - Unable to launch X application after changing the hostname with hostname command line
Summary: Unable to launch X application after changing the hostname with hostname comm...
Alias: None
Product: Fedora
Classification: Fedora
Component: XFree86   
(Show other bugs)
Version: 6
Hardware: i586 Linux
Target Milestone: ---
Assignee: X/OpenGL Maintenance List
QA Contact: David Lawrence
Depends On:
TreeView+ depends on / blocked
Reported: 2007-04-04 10:13 UTC by Frederic Hornain
Modified: 2018-04-11 16:14 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2007-04-04 13:17:14 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Frederic Hornain 2007-04-04 10:13:45 UTC
Description of problem:
Well, I am unable to launch for instance "system-config-users" after having 
changed the hostname from "localhost" to "my_chosen_hostname" with the command 
line hostname.

Version-Release number of selected component (if applicable):

How reproducible:
Easily if you have a X server on your local machine

Steps to Reproduce:
1. Be connected on an X session with you favorite username.
2. Open a Terminal windows in order to enter command line.
3. do an su - and be connected as root.
4. do a "hostname blablabla" in order to change your hostname from "localhost" 
to "blablabla".
5. run the system-config-user command
6. and finally you should have the following message : See actual result.
Actual results:

Xlib: connection to ":0.0" refused by server
Xlib: No protocol specified

Unable to import modules. Maybe you are not running under X ?

Expected results:

Well, I should see the user-configuration window.

Additional info:

Comment 1 Matěj Cepl 2007-04-04 13:17:14 UTC
Reporter, this is not problem of X, but in your configuration. Nobody is allowed
to run application on your X-server, and that includes root. In order to allow
root to run X applications, you have to allow it explicitly with xhost, for
example by running (as normal user owning X-server):

xhost local:

So, this is not a bug.

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