Bug 235175 - Unable to launch X application after changing the hostname with hostname command line
Unable to launch X application after changing the hostname with hostname comm...
Product: Fedora
Classification: Fedora
Component: XFree86 (Show other bugs)
i586 Linux
medium Severity medium
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Assigned To: X/OpenGL Maintenance List
David Lawrence
Depends On:
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Reported: 2007-04-04 06:13 EDT by Frederic Hornain
Modified: 2018-04-11 12:14 EDT (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2007-04-04 09:17:14 EDT
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Description Frederic Hornain 2007-04-04 06:13:45 EDT
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 09:17:14 EDT
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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