CompTIA Linux Study Guide by Roderick W. Smith

CompTIA Linux Study Guide by Roderick W. Smith

Author:Roderick W. Smith [Smith, Roderick W.]
Language: eng
Format: epub
Published: 2014-02-22T14:05:37+00:00


Thus, you may need to go digging through the files in your /etc directory

to find the correct setting. If you can’t find the setting, try using grep to

search for strings such as DISPLAYMANAGER or the name of the XDMCP

server that’s currently running.

Configuring an XDMCP Server

XDMCP servers, like most programs, can be configured. Unfortunately,

this configuration varies from one server to another, although there are

some commonalities. In the following pages, I provide some details for

configuring XDM, KDM, and GDM.

Configuring XDM

XDM is the simplest of the major XDMCP servers. It accepts usernames

and passwords but doesn’t enable users to perform other actions, such as

choose which desktop environment to run. (This must be configured

through user login files.)

XDM’s main configuration file is /etc/X11/xdm/xdm-config. Most

distributions ship with a basic xdm-config file that should work fine for

a local workstation. If you want to enable the computer to respond to

remote login requests from other X servers on the network or if you want

to verify that the system is not so configured, you should pay attention to

this line:

DisplayManager.requestPort: 0

This line tells XDM to not access a conventional server port. To

activate XDM as a remote login server, you should change 0 to 177, the

traditional XDMCP port. You must then restart XDM. When so

configured, users on other computers can initiate remote X-based logins

to your computer via XDMCP. This can be handy on local networks, but

it’s also a security risk, which is why the default is to not enable such

access.



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