Gdmconfig Manual
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# The Expert Options

Below are the options for the `Security` , `XDMCP`, `X-server setup`, `Login sessions`, and `Miscellaneous` tabs.

Security

  Figure 8. The security tab

Allow root to login with GDM

  Allow priviledged users, such as root, to login via the GDM.

  | PAM supported systems
  | On systems that support PAM, this option is ignored, and it becomes the responsiblity of the PAM libraries to determine whether the user will be on the local display or not.

Kill 'init' clients

  Allow the GDM to kill X clients that start from initialization scripts when a user logs in.

Authentication errors should be verbose

  Enable errors in authentication to be displayed to the user(s) in the GDM display.

Permissions:

  Determine the permission levels in relation to writable directories and files of other users. The World writable selection allows the GDM to view world writable files and directories. The Group writable selection allows the GDM to view only group writable files and directories. Finally, the Paranoia selection will only accept files and directories that the user owns.

GDM runs as this user

  Allows the GDM to be run as the specified user.

GDM runs as this group

  Allows the GDM to be run as the specified group.

User 'auth' directory

  Allow the directory which contains the user's .Xauthority file to be specified

User 'auth' FB directory

  In case the gdm fails to update the user's .Xauthority file, a cookie will be created in the specified directory.

User 'auth' File

  Specify the name of the file in which to store a user's cookies.

Retry delay

  Specify the number of seconds the GDM should wait before reactivating the entry field after a failed login attempt.

Maximum user file length

  Allows the maximum size of the largest readable/writable file to be specified. The GDM will refuse to read or write to a file bigger than the given value. The value is specified in bytes.

XDMCP

  Figure 9. The XDMCP tab

Enable XDMCP

  Allow a remote X-terminal to request a session from the current host. Enabling this option makes visible the connection settings.(X Display Manager Control Protocol)

Honour indirect requests

  Enable choosing for X-terminals which don't supply their own display browser.

Listen on UDP port

  Listen to UDP(user datagram protocol) requests on the specified port.

Maximum pending requests

  Restrict the GDM to a fixed size queue of the specified pending connections.

  | Denial of Service Attacks
  | This option has been included to avoid DOS(Denial of Service Attacks). This parameter only limits the number of allowed displays initiating a connection at any one given time, and does not limit the number of total remote displays which can be managed.

Max pending indirect requests

  Allow only the specified number of displays with the host chooser at any one given time.

Maximum remote sessions

  Allow only the specified number of remote displays to be able to use the host.

Maximum wait time

  Wait for the specified amount of time in seconds before the requesting display is removed from the pending queue.

Maximum indirect wait time

  Wait for the specified amount of time, in seconds, between when a display requests a chooser and the completion of the protocol negotiation before removing display from the pending list.

Displays per host

  Specifies the number of displays that can run on any one host to be set.

Ping interval

  Specifies the interval, in minutes, that the gdm waits between issuing pings to make sure the display is still alive.

  Allows the specification of a script to run to set the willing headers sent by the manager.

X-server setup

  Figure 10. The xserver setup tab

Servers

  Displays a list of server definitions. From the buttons on the right, one can create aliases for a specific server setup. Enabling a server as Flexible, indicates that the server can be started on demand.

Static Servers

  Allows the selection of servers which run always run. By picking one of the server definitions via the buttons on the right, one can setup the desired static server(s).

Always restart X servers

  Enable the X server to restart after every logout.

Standard X server

  Indicates the X server to be used and its respective path.

Xnest server

  Indicates the Xnest server to be used and its respective path.

Maximum number of flexible servers

  Indicates the maximum number of flexible servers, that may be running at any one given time.

Failsafe X server

  Indicates the Failsafe X server to be used and its respective path.

Script to run when X is crashing

  Indicates a script to run in the event on's X session keeps crashing.

X configurator binaries to try

  Indicates which binaries to use when an X session, or X itself, crashes.

Login sessions

  Figure 11. The Login sessions tab

Session directory

  The directory that contains script(s) to be run at the begining of a session

Available Sessions

  List the available sessions in which to choose from. The selected session will appear in the Selected session name field. Under this field, the session script is displayed.

Gnome Chooser

  If a session named Gnome is present, enable the Gnome Chooser session to be displayed.

Gnome Failsafe

  Enable the Gnome Failsafe session to be displayed.

Xterm Failsafe

  Enable the Xterm Failsafe session to be displayed.

Enable debugging output

  Allow debugging information to be displayed

Add session

  Create and add a new session to be made available.

Remove session

  Delete the session selected in the Available Sessions menu.

Set as default

  Enable the selected session in the Available Sessions menu to be the default.

  | Default session
  | The current default session is indicated by a light blue highlight under the Available Sessions menu.

Miscellaneous

  Figure 12. The Miscellaneous tab

Enable debugging output

  Enable the debugging output to be logged into the syslog file.

  | Debug output to syslog
  | Though a convieniant method to help track problems, this option, when selected, can fill up a system's log files rather quickly. This is not recommended for normal use

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The Basic Options |  | The System Options