Cannot start system-config-users

And are you running an X-server? Are you trying to start it through a Terminal in Gnome/KDE?

Did you try with "xhost +" and then starting system-config-users?

type xhost on command prompt but it returns command not found...

How to configure the LInux to run x-server ? Tks

You should check if X11 is installed on your system.

To find out what you need to install to get xhost use something like this:

yum whatprovides "*/xhost

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It's probably something like xorg-x11-server-utils

Also check with "yum grouplist" to see if you can install the X11 environment as a whole.

what do you want to do to users?
You can add/delete/modify on the command line easy enough.

Is there a system-config-users-tui?

yum whatprovides "xhosts*" will display :

xorg-x11-server-utils-7.7-2.el6.x86_64  : X.Org X11 X server utilities

How to install it further ? Tks

You can install it with "yum install xorg-x11-server-utils"

If you want to install it via groupinstall (this will install much more though, so I don't know what you want to achieve, is it a server or desktop?) you can do something like this:

"yum groupinstall "X Window System" "Desktop" "Desktop Platform" "General Purpose Desktop""

WARNING this installs a complete desktop environment

You can slim it down with only doing something like this:

"yum groupinstall "X Window System""

after installing the package, run

xhost   or
xhost +

xhost: unable to open display ""

Any idea ? Tks

Type in "DISPLAY" in the terminal followed by enter, does it give anything?

-bash: DISPLAY: command not found

hmmm, ok ... Probably not installed then.

Try this:

export DISPLAY=your_hostname:0.0

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Where "your_hostname" is the name of your system, for example "box.domain.dns"

After that try your command again

#hostname
sleung.local

#export DISPLAY=sleung.local:0.0
#xhost
xhost unable to open display "sleung.local:0.0"

Any  idea ?

Tks

Do the export again, like this:

export DISPLAY=":0.0"

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or

export DISPLAY="your_ip:0.0"

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try "xhost +"

If this still doesn't work what's the result of this: "echo $hostname"

pam.png

Tks. Will give another try later, Tks