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[root@localhost gdm]# vi /etc/X11/gdm/gdm.conf

# You can also use the gdm-restart and gdm-safe-restart scripts which just
# do the above for you.
#
# For full reference documentation see the gnome help browser under
# GNOME|System category.  You can also find the docs in HTML form
# on http://www.jirka.org/gdm.html
#
# NOTE: Some of these are commented out but still show their default values.
# If you wish to change them you must remove the '#' from the beginning of
# the line.  The commented out lines are lines where the default might
#
# Have fun! - George

[daemon]
# Automatic login, if true the first local screen will automatically logged
# in as user as set with AutomaticLogin key.
AutomaticLoginEnable=false
AutomaticLogin=

# Timed login, useful for kiosks.  Log in a certain user after a certain
# amount of time
TimedLoginEnable=false
TimedLogin=
TimedLoginDelay=30

# The gdm configuration program that is run from the login screen, you should
# probably leave this alone
#Configurator=/usr/sbin/gdmsetup --disable-sound --disable-crash-dialog

# The chooser program.  Must output the chosen host on stdout, probably you
# should leave this alone
#Chooser=/usr/bin/gdmchooser

# Greeter for local (non-xdmcp) logins.  Change gdmgreeter to gdmlogin to
# get the standard greeter.
Greeter=/usr/bin/gdmgreeter

# The greeter for xdmcp logins, usually you want a less graphically intensive
# greeter here so it's better to leave this with gdmlogin
#RemoteGreeter=/usr/bin/gdmlogin

# Launch the greeter with an additional list of colon seperated gtk
# modules. This is useful for enabling additional feature support
# e.g. gnome accessibility framework. Only "trusted" modules should
# be allowed to minimise security holes
#AddGtkModules=false
# By default these are the accessibility modules
#GtkModulesList=gail:atk-bridge:/usr/lib64/gtk-2.0/modules/libdwellmouselistener:/usr/lib64/gtk-2.0/modules/libkeymouselistener

# Default path to set.  The profile scripts will likely override this
DefaultPath=/usr/local/bin:/usr/bin:/bin:/usr/X11R6/bin
# Default path for root.  The profile scripts will likely override this
RootPath=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/X11R6/bin

# If you are having trouble with using a single server for a long time and
# want gdm to kill/restart the server, turn this on
#AlwaysRestartServer=false

# since most users will not need this and it's more of a security risk
# then anything else.
# Note: Anytime we find a -query or -indirect on the command line we do
# not add a "-nolisten tcp", as then the query just wouldn't work, so
# this setting only affects truly local sessions.
#DisallowTCP=true
# By default never place cookies if we "detect" NFS.  We detect NFS
# by detecting "root-squashing".  It seems bad practice to place
# cookies on things that go over the network by default and thus we
# don't do it by default.  Sometimes you can however use safe remote
# filesystems where this is OK and you may want to have the cookie in your
# home directory.
#NeverPlaceCookiesOnNFS=true

# XDMCP is the protocol that allows remote login.  If you want to log into
# gdm remotely (I'd never turn this on on open network, use ssh for such
# remote usage that).  You can then run X with -query <thishost> to log in,
# or -indirect <thishost> to run a chooser.  Look for the 'Terminal' server
# type at the bottom of this config file.
[xdmcp]
# Distributions: Ship with this off.  It is never a safe thing to leave
# out on the net.  Setting up /etc/hosts.allow and /etc/hosts.deny to only
# allow local access is another alternative but not the safest.
# Firewalling port 177 is the safest if you wish to have xdmcp on.
# Read the manual for more notes on the security of XDMCP.
Enable=true
# Honour indirect queries, we run a chooser for these, and then redirect
# the user to the chosen host.  Otherwise we just log the user in locally.
#HonorIndirect=true
# Maximum pending requests
#MaxPending=4
#MaxPendingIndirect=4
# Maximum open XDMCP sessions at any point in time
#MaxSessions=16
# Maximum wait times
#MaxWait=15
#MaxWaitIndirect=15
# How many times can a person log in from a single host.  Usually better to
# keep low to fend off DoS attacks by running many logins from a single
# host.  This is now set at 2 since if the server crashes then gdm doesn't

:/xdmcp