Arch Linux

knowNothing23

Member

Registered: 2013-08-25

Posts: 33

No protocol specified xhost: unable to open display ":0.0"

Hello all,

I know this is a common problem.
Whenever I try to start firefox, xclock, dolphin, or any gui from terminal it shows this errors:

/home/jav/.Xauthority
[jav@localhost ~]$ su
Password: 
[root@new-host jav]# firefox 

(process:2898): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
No protocol specified
No protocol specified
Error: cannot open display: :0.0
[root@new-host jav]# su
[root@new-host jav]# jav
bash: jav: command not found
[root@new-host jav]# cls
bash: cls: command not found
[root@new-host jav]# 
[root@new-host jav]# su jav
[jav@new-host ~]$ xeyes
bash: xeyes: command not found
[jav@new-host ~]$ xhost +
No protocol specified
xhost:  unable to open display ":0.0"
[jav@new-host ~]$ xhost + :0.0
No protocol specified
xhost:  unable to open display ":0.0"
[jav@new-host ~]$ xhost + jav
No protocol specified
xhost:  unable to open display ":0.0"
[jav@new-host ~]$ ps aux | grep X11
jav       3023  0.0  0.0  10696  2232 pts/1    S+   04:36   0:00 grep X11
[jav@new-host ~]$ dolphin 
No protocol specified
dolphin: cannot connect to X server :0.0
[jav@new-host ~]$ 

My $DISPLAY and $XAUTHORITY are present in my environment; however, things do not work.

I have tried several "solutions" and none work for me
I have tried this:
https://bbs.archlinux.org/viewtopic.php?id=108695
http://unix.stackexchange.com/questions … -specified
http://www.linuxquestions.org/questions … 175462031/
http://unix.stackexchange.com/questions … -superuser

karol

Archivist

Registered: 2009-05-06

Posts: 25,440

Re: No protocol specified xhost: unable to open display ":0.0"

It's not clear
1. are you running from X or from tty
2. why are you trying to run GUI apps as root. https://wiki.archlinux.org/index.php/Ru … ps_as_root

knowNothing23

Member

Registered: 2013-08-25

Posts: 33

Re: No protocol specified xhost: unable to open display ":0.0"

I startx into a KDM display manager.
From here I open my terminal and open chrome and do my thing.
Then, if I want to open any GUI from the terminal. i.e, evince, firefox, dolphin, or whatever. I get that error.

If I try to open those GUIs without the terminal, then the GUIs would just don't show up at all and no error
message is shown.

Even when I try to run things as non-root I get those error messages.

Help.

Last edited by knowNothing23 (2015-03-21 13:37:22)

karol

Archivist

Registered: 2009-05-06

Posts: 25,440

Re: No protocol specified xhost: unable to open display ":0.0"

What's the output of

uname -a
env | grep -e DISPLAY -e AUTHORITY
loginctl show-session $XDG_SESSION_ID

When did this problem start?

Edit: Also

echo $HOSTNAME

Last edited by karol (2015-03-21 13:46:38)

knowNothing23

Member

Registered: 2013-08-25

Posts: 33

Re: No protocol specified xhost: unable to open display ":0.0"

The problem started since I installed my arch linux for the first time.
I had this problem before with other laptops, but the other solutions worked that time.

BTW, I also get the error of warning some files such as /temp/*  has as owner other user or something.
This happens when I install stuff with pacman.

Here's the output you requested:

[jav@localhost ~]$ uname -a
Linux new-host.home 3.18.2-2-ARCH #1 SMP PREEMPT Fri Jan 9 07:37:51 CET 2015 x86_64 GNU/Linux
[jav@localhost ~]$ env | grep -e DISPLAY -e AUTHORITY
DISPLAY=:0.0
XAUTHORITY=/home/jav/.Xauthority
[jav@localhost ~]$ loginctl show-session $XDG_SESSION_ID
Id=c1
Name=jav
Timestamp=Sat 2015-03-21 15:59:52 EDT
TimestampMonotonic=26940669
VTNr=1
TTY=tty1
Remote=no
Service=login
Scope=session-c1.scope
Leader=271
Audit=0
Type=tty
Class=user
Active=yes
State=active
IdleHint=no
IdleSinceHint=1426967992537715
IdleSinceHintMonotonic=26842810
[jav@localhost ~]$ echo $HOSTNAME
localhost
[jav@localhost ~]$ 

Thanks for the help!

Last edited by knowNothing23 (2015-03-21 20:10:35)

jasonwryan

Anarchist

From: .nz

Registered: 2009-05-09

Posts: 30,426

Website

Re: No protocol specified xhost: unable to open display ":0.0"

Fix your hostname: https://wiki.archlinux.org/index.php/Hostname

And don't run your browser as root: that is just insane.

---

Arch + dwm   •   Mercurial repos  •   Surfraw

Registered Linux User #482438

knowNothing23

Member

Registered: 2013-08-25

Posts: 33

Re: No protocol specified xhost: unable to open display ":0.0"

I read the page, but I don't know what you mean by fix.

Should my hostname be jav?

karol

Archivist

Registered: 2009-05-06

Posts: 25,440

Re: No protocol specified xhost: unable to open display ":0.0"

I read the page, but I don't know what you mean by fix.

Should my hostname be jav?

Did you run

# hostnamectl set-hostname localhost

?
In your first post I see

[jav@localhost ~]$ su
Password: 
[root@new-host jav]#

Is this what's literally printed on th screen?

Alad

Wiki Admin/IRC Op

From: Bagelstan

Registered: 2014-05-04

Posts: 2,420

Website

Re: No protocol specified xhost: unable to open display ":0.0"

In your first post I see

[jav@localhost ~]$ su
Password: 
[root@new-host jav]#

Is this what's literally printed on th screen?

I remember having that with a correctly configured hostname (in /etc/hosts and /etc/hostname), but it was "root@new-host-2". No idea why that happens.

---

Mods are just community members who have the occasionally necessary option to move threads around and edit posts. -- Trilby

jasonwryan

Anarchist

From: .nz

Registered: 2009-05-09

Posts: 30,426

Website

Re: No protocol specified xhost: unable to open display ":0.0"

I read the page, but I don't know what you mean by fix.

Should my hostname be jav?

Your hostname should be whatever you want it to be.

Please don't expect to have your hand held here...

---

Arch + dwm   •   Mercurial repos  •   Surfraw

Registered Linux User #482438

knowNothing23

Member

Registered: 2013-08-25

Posts: 33

Re: No protocol specified xhost: unable to open display ":0.0"

@jasonwryan: My hostname is set as localhost. If it can be any arbitrary name, then this hostname should do.

@karol: Thanks, I think that

# hostnamectl set-hostname localhost

fixed my problem, but then again this problem is weird.
It would come and go.
And, yes code snippet I posted at the beginning is literally what my computer shows.

jasonwryan

Anarchist

From: .nz

Registered: 2009-05-09

Posts: 30,426

Website

Re: No protocol specified xhost: unable to open display ":0.0"

@jasonwryan: My hostname is set as localhost. If it can be any arbitrary name, then this hostname should do.

If a static hostname is set, and is valid (something other than localhost)...

---

Arch + dwm   •   Mercurial repos  •   Surfraw

Registered Linux User #482438