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I'm using Arch Linux + Xfce.

When I disconnect from a internet network(WiFi or Wire), no programs will run and gets me following error:

[kamix@localhost ~]$ gedit
No protocol specified

** (gedit:5064): WARNING **: Could not open X display
No protocol specified
Unable to init server: Could not connect: Connection refused

(gedit:5064): Gtk-WARNING **: cannot open display: :0.0
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2  
Is it possible that dhcpcd is changing your hostname? – phoops May 5 '14 at 9:31
up vote 0 down vote accepted

Should edit /etc/NetworkManager/NetworkManager.conf with this content :

[main]
plugins = keyfile

[keyfile]
hostname = <your-host-name>

You must replace your hostname(like localhost) with <your-host-name>.

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