使用Xmanager远程桌面LINUX系统

kinr

实验环境

实验平台
   

WIN7 旗舰版 64bit

虚拟机软件
   

VM VirtualBox 4.2

虚拟操作系统
   

CentOS5.6 64bit

远程桌面软件
   

Xmanager Enterprise 4

一、总结过程记录

（1）、修改custom.conf

[iyunv@xckydb ~]# vi /etc/gdm/custom.conf

--向xdmcp添加信息，把Enable=0改为Enable=1

（2）、修改Xaccess

[iyunv@xckydb ~]# vi /usr/share/config/kdm/Xaccess

--把“#*#any host can get a login window”这行信息前#去掉

（3）、修改kdmrc

[iyunv@xckydb ~]# vi /usr/share/config/kdm/kdmrc

--把Xdmcp下将Enable改为true（Enable=true）

（4）、重启系统

[iyunv@xckydb ~]# reboot

（5）、查看177端口

[iyunv@xckydb ~]# netstat -na|grep 177

--XDMCP服务对应的端口为177

udp        0      0 0.0.0.0:177                 0.0.0.0:*

（6）、使用Xmanager软件Xbrowser实现远程桌面LINUX系统

包括配置文件的全部内容及操作截图，参考如下“详细过程记录”。
二、详细过程记录
1. 修改LINUX系统设置

（1）、修改custom.conf

[iyunv@xckydb ~]# vi /etc/gdm/custom.conf

--向xdmcp添加信息，把Enable=0改为Enable=1

--custom.conf文件内全部内容如下


    GDM Configuration Customization file.  
    #  
    # This file is the appropriate place for specifying your customizations to the  
    # GDM configuration.   If you run gdmsetup, it will automatically edit this  
    # file for you and will cause the daemon and any running GDM GUI programs to  
    # automatically update with the new configuration.  Not all configuration  
    # options are supported by gdmsetup, so to modify some values it may be  
    # necessary to modify this file directly by hand.  
    #  
    # Older versions of GDM used the "gdm.conf" file for configuration.  If your  
    # system has an old gdm.conf file on the system, it will be used instead of  
    # this file - so changes made to this file will not take effect.  Consider  
    # migrating your configuration to this file and removing the gdm.conf file.  
    #  
    # To hand-edit this file, simply add or modify the key=value combination in  
    # the appropriate section in the template below.  Refer to the comments in the  
    # /usr/share/gdm/defaults.conf file for information about each option.  Also  
    # refer to the reference documentation.  
    #  
    # If you hand edit a GDM configuration file, you should run the following  
    # command to get the GDM daemon to notice the change.  Any running GDM GUI  
    # programs will also be notified to update with the new configuration.  
    #  
    # gdmflexiserver --command="UPDATE_CONFIG <configuration key>"  
    #  
    # e.g, the "Enable" key in the "[debug]" section would be "debug/Enable".  
    #  
    # You can also run gdm-restart or gdm-safe-restart to cause GDM to restart and  
    # re-read the new configuration settings.  You can also restart GDM by sending  
    # a HUP or USR1 signal to the daemon.  HUP behaves like gdm-restart and causes  
    # any user session started by GDM to exit immediately while USR1 behaves like  
    # gdm-safe-restart and will wait until all users log out before restarting GDM.  
    #  
    # 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.gnome.org/projects/gdm/  
    #  
    # NOTE: Lines that begin with "#" are considered comments.  
    #  
    # Have fun!  
      
    [daemon]  
      
    [security]  
      
    [xdmcp]  
    Enable=1  
    </span>[gui]  
      
    [greeter]  
      
    [chooser]  
      
    [debug]  
      
    # Note that to disable servers defined in the defaults.conf file (such as  
    # 0=Standard, you must put a line in this file that says 0=inactive, as  
    # described in the Configuration section of the GDM documentation.  
    #  
    [servers]  
      
    # Also note, that if you redefine a [server-foo] section, then GDM will  
    # use the definition in this file, not the defaults.conf file.  It is  
    # currently not possible to disable a [server-foo] section defined  
    # in the defaults.conf file.  
    #  

（2）、修改Xaccess

[iyunv@xckydb ~]# vi /usr/share/config/kdm/Xaccess

--把“#*#any host can get a login window”这行信息前#去掉

改之前：

改之后：

--Xaccess文件内全部内容如下


    # $XdotOrg: app/xdm/config/Xaccess,v 1.2 2004/04/23 19:54:43 eich Exp $  
    # $Xorg: Xaccess,v 1.3 2000/08/17 19:54:17 cpqbld Exp $  
    # $XFree86: xc/programs/xdm/config/Xaccess,v 1.4 2003/07/09 15:27:40 tsi Exp $  
    #  
    # Access control file for XDMCP connections  
    #  
    # To control Direct and Broadcast access:  
    #  
    #       pattern  
    #  
    # To control Indirect queries:  
    #  
    #       pattern         list of hostnames and/or macros ...  
    #  
    # To use the chooser:  
    #  
    #       pattern         CHOOSER BROADCAST  
    #  
    # or  
    #  
    #       pattern         CHOOSER list of hostnames and/or macros ...  
    #  
    # To define macros:  
    #  
    #       %name           list of hosts ...  
    #  
    # To control which addresses xdm listens for requests on:  
    #  
    #       LISTEN          address [list of multicast groups ... ]  
    #  
    # The first form tells xdm which displays to respond to itself.  
    # The second form tells xdm to forward indirect queries from hosts matching  
    # the specified pattern to the indicated list of hosts.  
    # The third form tells xdm to handle indirect queries using the chooser;  
    # the chooser is directed to send its own queries out via the broadcast  
    # address and display the results on the terminal.  
    # The fourth form is similar to the third, except instead of using the  
    # broadcast address, it sends DirectQuerys to each of the hosts in the list  
    # The fifth form tells xdm which addresses to listen for incoming connections  
    # on.  If present, xdm will only listen for connections on the specified  
    # interfaces and/or multicast groups.  
    #  
    # In all cases, xdm uses the first entry which matches the terminal;  
    # for IndirectQuery messages only entries with right hand sides can  
    # match, for Direct and Broadcast Query messages, only entries without  
    # right hand sides can match.  
    #  
      
    *                                       #any host can get a login window  
      
    #  
    # To hardwire a specific terminal to a specific host, you can  
    # leave the terminal sending indirect queries to this host, and  
    # use an entry of the form:  
    #  
      
    #terminal-a     host-a  
      
      
    #  
    # The nicest way to run the chooser is to just ask it to broadcast  
    # requests to the network - that way new hosts show up automatically.  
    # Sometimes, however, the chooser can't figure out how to broadcast,  
    # so this may not work in all environments.  
    #  
      
    #*              CHOOSER BROADCAST       #any indirect host can get a chooser  
      
    #  
    # If you'd prefer to configure the set of hosts each terminal sees,  
    # then just uncomment these lines (and comment the CHOOSER line above)  
    # and edit the %hostlist line as appropriate  
    #  
      
    #%hostlist      host-a host-b  
      
    #*              CHOOSER %hostlist       #  
      
    #  
    # If you have a machine with multiple network interfaces or IP addresses  
    # you can control which interfaces accept XDMCP packets by listing a LISTEN  
    # line for each interface you want to listen on.  You can additionally list  
    # one or more multicast groups after each address to listen on those groups  
    # on that address.  
    #  
    # If no LISTEN is specified, the default is the same as "LISTEN *" - listen on  
    # all unicast interfaces, but not for multicast packets.  If any LISTEN lines  
    # are specified, then only the listed interfaces will be listened on.  
    #  
    # IANA has assigned FF0X:0:0:0:0:0:0:12B as the permanently assigned  
    # multicast addresses for XDMCP, where X in the prefix may be replaced  
    # by any valid scope identifier, such as 1 for Node-Local, 2 for Link-Local,  
    # 5 for Site-Local, and so on.  The default is equivalent to the example shown  
    # here using the Link-Local version to most closely match the old IPv4 subnet  
    # broadcast behavior.  
    #  
    # LISTEN                * ff02:0:0:0:0:0:0:12b  
      
    # This example shows listening for multicast on all scopes up to site-local  
    #  
    # LISTEN        * ff01:0:0:0:0:0:0:12b ff02:0:0:0:0:0:0:12b ff03:0:0:0:0:0:0:12b ff04:0:0:0:0:0:0:12b ff05:0:0:0:0:0:0:12b  

（3）、修改kdmrc

[iyunv@xckydb ~]# vi /usr/share/config/kdm/kdmrc

--把Xdmcp下将Enable改为true（Enable=true）

--kdmrc文件内全部内容如下


    # KDM master configuration file  
    #  
    # Definition: the greeter is the login dialog, i.e., the part of KDM  
    # which the user sees.  
    #  
    # You can configure every X-display individually.  
    # Every display has a display name, which consists of a host name  
    # (which is empty for local displays specified in {Static|Reserve}Servers),  
    # a colon, and a display number. Additionally, a display belongs to a  
    # display class (which can be ignored in most cases; the control center  
    # does not support this feature at all).  
    # Sections with display-specific settings have the formal syntax  
    # "[X-" host [":" number [ "_" class ]] "-" sub-section "]"  
    # You can use the "*" wildcard for host, number, and class. You may omit  
    # trailing components; they are assumed to be "*" then.  
    # The host part may be a domain specification like ".inf.tu-dresden.de".  
    # It may also be "+", which means non-empty, i.e. remote displays only.  
    # From which section a setting is actually taken is determined by these  
    # rules:  
    # - an exact match takes precedence over a partial match (for the host part),  
    #   which in turn takes precedence over a wildcard ("+" taking precedence  
    #   over "*")  
    # - precedence decreases from left to right for equally exact matches  
    # Example: display name "myhost:0", class "dpy".  
    # [X-myhost:0_dpy] precedes  
    # [X-myhost:0_*] (same as [X-myhost:0]) precedes  
    # [X-myhost:*_dpy] precedes  
    # [X-myhost:*_*] (same as [X-myhost]) precedes  
    # [X-+:0_dpy] precedes  
    # [X-*:0_dpy] precedes  
    # [X-*:0_*] (same as [X-*:0]) precedes  
    # [X-*:*_*] (same as [X-*])  
    # These sections do NOT match this display:  
    # [X-hishost], [X-myhost:0_dec], [X-*:1], [X-:*]  
    # If a setting is not found in any matching section, the default is used.  
    #  
    # Every comment applies to the following section or key. Note that all  
    # comments will be lost if you change this file with the kcontrol frontend.  
    # The defaults refer to KDM's built-in values, not anything set in this file.  
    #  
    # Special characters need to be backslash-escaped (leading and trailing  
    # spaces (\s), tab (\t), linefeed (\n), carriage return (\r) and the  
    # backslash itself (\\)).  
    # In lists, fields are separated with commas without whitespace in between.  
    # Some command strings are subject to simplified sh-style word splitting:  
    # single quotes (') and double quotes (") have the usual meaning; the backslash  
    # quotes everything (not only special characters). Note that the backslashes  
    # need to be doubled because of the two levels of quoting.  
      
    [General]  
    # Where KDM should store its PID. Default is "" (don't store)  
    PidFile=/var/run/kdm.pid  
    # Whether KDM should lock the pid file to prevent having multiple KDM  
    # instances running at once. Leave it "true", unless you're brave.  
    #LockPidFile=false  
    # Where to store authorization files. Default is /var/run/xauth  
    #AuthDir=/tmp  
    # Whether KDM should automatically re-read configuration files, if it  
    # finds them having changed. Just keep it "true".  
    #AutoRescan=false  
    # Additional environment variables KDM should pass on to kdm_config, kdm_greet,  
    # Xsetup, Xstartup, Xsession, and Xreset. LD_LIBRARY_PATH is a good candidate;  
    # otherwise it shouldn't be necessary very often.  
    #ExportList=SOME_VAR,ANOTHER_IMPORTANT_VAR  
    # Where the command FiFos should be created. Make it empty to disable  
    # the FiFos. Default is /var/run/xdmctl  
    #FifoDir=/tmp  
    # To which group the command FiFos should belong.  
    # Default is -1 (effectively root)  
    #FifoGroup=xdmctl  
    # This option exists solely for the purpose of a clean automatic upgrade.  
    # Do not even think about changing it!  
    ConfigVersion=2.3  
    # List of permanent displays. Displays with a hostname are foreign. A display  
    # class may be specified separated by an underscore.  
    # Default is ":0"  
    StaticServers=:0  
    # List of on-demand displays. See StaticServers for syntax.  
    # Default is ""  
    ReserveServers=:1,:2,:3  
    # VTs to allocate to X-servers. A negative number means that the VT will be  
    # used only if it is free. If all VTs in this list are used up, the next free  
    # one greater than the last one in this list will be allocated.  
    # Default is ""  
    # ServerVTs=-7  
    # TTYs (without /dev/) to monitor for activity while in console mode.  
    # Default is ""  
    ConsoleTTYs=tty1,tty2,tty3,tty4,tty5,tty6  
      
    [Xdmcp]  
    Enable=true  
    # Whether KDM should listen to XDMCP requests. Default is true.  
    # Enable=false  
    # The UDP port KDM should listen on for XDMCP requests. Don't change the 177.  
    #Port=177  
    # File with the private keys of X-terminals. Required for XDM authentication.  
    # Default is /usr/share/config/kdm/kdmkeys  
    #KeyFile=  
    # XDMCP access control file in the usual XDM-Xaccess format.  
    # Default is /usr/share/config/kdm/Xaccess  
    # XXX i'm planning to absorb this file into kdmrc, but i'm not sure how to  
    # do this best.  
    Xaccess=/usr/share/config/kdm/Xaccess  
    # Number of seconds to wait for display to respond after the user has  
    # selected a host from the chooser. Default is 15.  
    #ChoiceTimeout=10  
    # Strip domain name from remote display names if it is equal to the local  
    # domain. Default is true  
    #RemoveDomainname=false  
    # Use the numeric IP address of the incoming connection instead of the  
    # host name. Use this on multihomed hosts. Default is false  
    #SourceAddress=true  
    # The program which is invoked to dynamically generate replies to XDMCP  
    # BroadcastQuery requests.  
    # By default no program is invoked and "Willing to manage" is sent.  
    Willing=/usr/share/config/kdm/Xwilling  
      
    [Shutdown]  
    # The command to run to halt the system. Default is /sbin/halt  
    HaltCmd=/sbin/poweroff  
    # The command to run to reboot the system. Default is /sbin/reboot  
    #RebootCmd=  
    # Whether one can shut down the system via the global command FiFo.  
    # Default is false  
    #AllowFifo=true  
    # Whether one can abort still running sessions when shutting down the system  
    # via the global command FiFo. Default is true  
    #AllowFifoNow=false  
    # Offer LiLo boot options in shutdown dialog. Default is false  
    #UseLilo=true  
    # The location of the LiLo binary. Default is /sbin/lilo  
    #LiloCmd=  
    # The location of the LiLo map file. Default is /boot/map  
    #LiloMap=  
      
    # Rough estimations about how many seconds KDM will spend at most on  
    # - opening a connection to the X-server (OpenTime):  
    #   OpenRepeat * (OpenTimeout + OpenDelay)  
    # - starting a local X-server (SeverTime): ServerAttempts * ServerTimeout  
    # - starting a display:  
    #   - local display: StartAttempts * (ServerTime + OpenTime)  
    #   - remote/foreign display: StartAttempts * OpenTime  
      
    # Core config for all displays  
    [X-*-Core]  
    # How long to wait before retrying to start the display after various  
    # errors. Default is 15  
    #OpenDelay=  
    # How long to wait before timing out XOpenDisplay. Default is 120  
    #OpenTimeout=  
    # How often to try the XOpenDisplay. Default is 5  
    #OpenRepeat=  
    # Try at most that many times to start a display. If this fails, the display  
    # is disabled. Default is 4  
    #StartAttempts=  
    # The StartAttempt counter is reset after that many seconds. Default is 30  
    #StartInterval=  
    # Ping remote display every that many minutes. Default is 5  
    #PingInterval=  
    # Wait for a Pong that many minutes. Default is 5  
    #PingTimeout=  
    # Restart instead of resetting the local X-server after session exit.  
    # Use it if the server leaks memory, etc. Default is false  
    #TerminateServer=true  
    # The signal needed to reset the local X-server. Default is 1 (SIGHUP)  
    #ResetSignal=  
    # The signal needed to terminate the local X-server. Default is 15 (SIGTERM)  
    #TermSignal=  
    # Need to reset the X-server to make it read initial Xauth file.  
    # Default is false  
    #ResetForAuth=true  
    # Create X-authorizations for local displays. Default is true  
    #Authorize=false  
    # Which X-authorization mechanisms should be used.  
    # Default is MIT-MAGIC-COOKIE-1  
    #AuthNames=  
    # The name of this X-server's Xauth file. Default is "", which means, that  
    # a random name in the AuthDir directory will be used.  
    #AuthFile=  
    # Specify a file with X-resources for the greeter, chooser and background.  
    # The KDE frontend doesn't care for this, so you don't need it unless you  
    # use an alternative chooser or another background generator than kdmdesktop.  
    # Default is ""  
    Resources=/etc/X11/Xresources  
    # The xrdb program to use to read the above specified recources.  
    # Default is /usr/X11R6/bin/xrdb  
    Xrdb=/usr/bin/xrdb  
    # A program to run before the greeter is shown. You should start kdmdesktop  
    # there. Also, xconsole can be started by this script.  
    # Default is ""  
    Setup=/usr/share/config/kdm/Xsetup  
    # A program to run before a user session starts. You should invoke sessreg  
    # there and optionally change the ownership of the console, etc.  
    # Default is ""  
    Startup=/usr/share/config/kdm/Xstartup  
    # A program to run after a user session exits. You should invoke sessreg  
    # there and optionally change the ownership of the console, etc.  
    # Default is ""  
    Reset=/usr/share/config/kdm/Xreset  
    # The program which is run as the user which logs in. It is supposed to  
    # interpret the session argument (see SessionsDirs) and start an appropriate  
    # session according to it.  
    # Default is /usr/X11R6/bin/xterm -ls -T  
    Session=/etc/X11/xinit/Xsession  
    SessionsDirs=/usr/share/xsessions  
    # The program to run if Session fails.  
    # Default is /usr/X11R6/bin/xterm  
    #FailsafeClient=  
    # The PATH for the Session program. Default is  
    # /bin:/usr/bin:/usr/X11R6/bin:/usr/local/bin  
    #UserPath=  
    # The PATH for Setup, Startup and Reset, etc. Default is  
    # /sbin:/usr/sbin:/bin:/usr/bin:/usr/X11R6/bin:/usr/local/bin  
    #SystemPath=  
    # The default system shell. Default is /bin/sh  
    #SystemShell=/bin/bash  
    # Where to put the user's X-server authorization file if ~/.Xauthority  
    # cannot be created. Default is /tmp  
    #UserAuthDir=  
    # The host chooser program to use.  
    # Default is /usr/bin/chooser  
    # XXX this is going to be integrated into the greeter (probably).  
    #Chooser=  
    # If "true", KDM will automatically restart a session after an X-server  
    # crash (or if it is killed by Alt-Ctrl-BackSpace). Note, that enabling  
    # this opens a security hole: a secured display lock can be circumvented.  
    # Default is false  
    AutoReLogin=false  
    # Allow root logins? Default is true  
    AllowRootLogin=false  
    # Allow to log in, when user has set an empty password? Default is true  
    AllowNullPasswd=true  
    # Who is allowed to shut down the system. This applies both to the  
    # greeter and to the command FiFo. Default is All  
    # "None" - no "Shutdown..." button is shown at all  
    # "Root" - the root password must be entered to shut down  
    # "All" - everybody can shut down the machine (Default)  
    AllowShutdown=Root  
    # Who is allowed to abort all still running sessions when shutting down.  
    # Same options as for AllowShutdown. Default is All  
    #AllowSdForceNow=Root  
    # The default choice for the shutdown condition/timing.  
    # "Schedule" - shutdown after all sessions exit (possibly at once) (Default)  
    # "TryNow" - shutdown, if no sessions are open, otherwise do nothing  
    # "ForceNow" - shutdown unconditionally  
    #DefaultSdMode=ForceNow  
    # The file (relative to $HOME) to redirect the session output to. This is  
    # a printf format string; one %s will be replaced with the display name.  
    # Default is ".xsession-errors"  
    ClientLogFile=.xsession-errors-%s  
      
    # Greeter config for all displays  
    [X-*-Greeter]  
    # Widget Style of the greeter:  
    # Default, Windows, Platinum, Motif, MotifPlus, CDE, SGI, and any styles you  
    # may have installed, e.g., HighColor; Default is "Default"  
    GUIStyle=Plastik  
    ColorScheme=Plastik  
    # What should be shown righthand of the input lines:  
    # "Logo" - the image specified by LogoPixmap (Default)  
    # "Clock" - a neat analog clock  
    # "None" - nothing  
    LogoArea=Clock  
    # The image to show when LogoArea=Logo. Default is kdelogo.png  
    #LogoPixmap=  
    # Normally, the greeter is centered on the screen. Use this, if you want  
    # it to appear elsewhere on the screen. Default is false  
    #GreeterPosFixed=false  
    #GreeterPosX=200  
    #GreeterPosY=100  
    # The headline in the greeter.  
    # The following character pairs are replaced:  
    # - %d -> current display  
    # - %h -> host name, possibly with domain name  
    # - %n -> node name, most probably the host name without domain name  
    # - %s -> the operating system  
    # - %r -> the operating system's version  
    # - %m -> the machine (hardware) type  
    # - %% -> a single %  
    # Default is "Welcome to %s at %n"  
    #GreetString=K Desktop Environment (%n)  
    # The font for the headline. Default is charter,24,bold  
    GreetFont=Sans,12,-1,5,75,0,0,0,0,0  
    # The normal font used in the greeter. Default is helvetica,12  
    StdFont=Sans,10,-1,5,50,0,0,0,0,0  
    # The font used for the "Login Failed" message. Default is helvetica,12,bold  
    FailFont=Sans,10,-1,5,75,0,0,0,0,0  
    # Whether the fonts shown in the greeter should be antialiased. Default is false  
    AntiAliasing=true  
    # What to do with the Num Lock modifier for the time the greeter is running:  
    # "On" -> - turn on  
    # "Off" -> - turn off  
    # "Keep" -> - don't change the state (Default)  
    #NumLock=Off  
    # Enable autocompletion in the user name line edit.  
    # Default is false  
    #UserCompletion=true  
    # Enable user list (names along with images) in the greeter.  
    # Default is true  
    UserList=false  
    # Language to use in the greeter. Default is en_US  
    # Language=de_DE  
    # Specify, which user names (along with pictures) should be shown in the  
    # greeter.  
    # "NotHidden" - all users except those listed in HiddenUsers (Default)  
    # "Selected" - only the users listed in SelectedUsers  
    # "None" - no user list will be shown at all  
    # ShowUsers=None  
    # For ShowUsers=Selected. Default is ""  
    #SelectedUsers=  
    # For ShowUsers=NotHidden. Default is ""  
    HiddenUsers=adm,alias,amanda,apache,bin,bind,daemon,exim,falken,ftp,games,gdm,gopher,halt,httpd,ident,ingres,kmem,lp,mail,mailnull,man,mta,mysql,named,news,nfsnobody,nobody,nscd,ntp,operator,pcap,pop,postfix,postgres,qmaild,qmaill,qmailp,qmailq,qmailr,qmails,radvd,reboot,rpc,rpcuser,rpm,sendmail,shutdown,squid,sympa,sync,tty,uucp,xfs,xten  
    # Special case of HiddenUsers: users with a UID less than this number  
    # (except root) will not be shown as well. Default is 0  
    MinShowUID=500  
    # Complement to MinShowUID: users with a UID greater than this number will  
    # not be shown as well. Default is 65535  
    #MaxShowUID=29999  
    # If false, the users are listed in the order they appear in /etc/passwd.  
    # If true, they are sorted alphabetically. Default is true  
    SortUsers=true  
    # Specify, if/which user should be preselected for log in.  
    # Note, that enabling this feature can be considered a security hole,  
    # as it presents a valid login name to a potential attacker, so he "only"  
    # needs to guess the password.  
    # "None" - don't preselect any user (Default)  
    # "Previous" - the user which successfully logged in last time  
    # "Default" - the user specified in the DefaultUser field  
    PreselectUser=None  
    # The user to preselect if PreselectUser=Default  
    #DefaultUser=ethel  
    # If this is true, the password input line is focused automatically if  
    # a user is preselected. Default is false  
    FocusPasswd=false  
    # The password input fields cloak the typed in text. Specify, how to do it:  
    # "NoEcho" - nothing is shown at all, the cursor doesn't move  
    # "OneStar" - "*" is shown for every typed letter (Default)  
    # "ThreeStars" - "***" is shown for every typed letter  
    EchoMode=OneStar  
    # Hold the X-server grabbed the whole time the greeter is visible.  
    # This may be more secure, but will disable any background. Default is false  
    #GrabServer=true  
    # How many seconds to wait for grab to succeed. Default is 3  
    #GrabTimeout=  
    Theme=/usr/share/apps/kdm/themes/TreeFlower  
    UseTheme=true  
      
    # Core config for local displays  
    [X-:*-Core]  
    # How often to try to run the X-server. Running includes executing it and  
    # waiting for it to come up. Default is 1  
    #ServerAttempts=  
    # How long to wait for a local X-server to come up. Default is 15  
    #ServerTimeout=  
    # The command line to start the X-server, without display number and VT spec.  
    # This string is subject to word splitting.  
    # Default is "/usr/bin/X -br"  
    #ServerCmd=/usr/bin/X -br  
    # Additional arguments for the X-servers for local sessions.  
    # This string is subject to word splitting.  
    # Default is ""  
    # ServerArgsLocal=-nolisten tcp  
    # Additional arguments for the X-servers for remote sessions.  
    # This string is subject to word splitting.  
    # Default is ""  
    #ServerArgsRemote=  
    # Restart instead of resetting the local X-server after session exit.  
    # Use it if the server leaks memory etc.  
    # Default is false  
    #TerminateServer=true  
    # The signal needed to reset the local X-server.  
    # Default is 1 (SIGHUP)  
    #ResetSignal=1  
    # The signal needed to terminate the local X-server.  
    # Default is 15 (SIGTERM)  
    #TermSignal=15  
    # Create X-authorizations for local displays.  
    # Default is true  
    #Authorize=false  
    # Which X-authorization mechanisms should be used.  
    # Default is "MIT-MAGIC-COOKIE-1"  
    #AuthNames=  
    # Need to reset the X-server to make it read initial Xauth file.  
    # Default is false  
    #ResetForAuth=true  
    # See above  
    AllowShutdown=All  
    # See above  
    AllowRootLogin=false  
    # See above  
    AllowNullPasswd=true  
    # Enable password-less logins on this display. USE WITH EXTREME CARE!  
    # Default is false  
    #NoPassEnable=true  
    # The users that don't need to provide a password to log in. NEVER list root!  
    #NoPassUsers=fred,ethel  
      
    # Greeter config for local displays  
    [X-:*-Greeter]  
    # Warn, if local X-authorization cannot be created. Default is true  
    # XXX this is a dummy currently  
    #AuthComplain=false  
    # The screen the greeter should be displayed on in multi-headed setups.  
    # The numbering starts with 0 and corresponds to the listing order in the  
    # active ServerLayout section of XF86Config. -1 means to use the upper-left  
    # screen. Default is 0  
    #GreeterScreen=-1  
    LoginMode=DefaultLocal  
    AllowClose=false  
      
    # Core config for 1st local display  
    [X-:0-Core]  
    # Enable automatic login on this display. USE WITH EXTREME CARE!  
    # Default is false  
    #AutoLoginEnable=true  
    # The user to log in automatically. NEVER specify root!  
    #AutoLoginUser=fred  
    # The password for the user to log in automatically. This is NOT required  
    # unless the user is to be logged into a NIS or Kerberos domain. If you use  
    # it, you must "chmod 600 kdmrc" for obvious reasons.  
    #AutoLoginPass=secret!  
    # The session for the user to log in automatically. This becomes useless after  
    # the user's first login, as the last used session will take precedence.  
    #AutoLoginSession=kde  
    # If "true", the auto-login is truly automatic, i.e., the user is logged in  
    # when KDM comes up. If "false", the auto-login must be initiated by crashing  
    # the X-server with Alt-Ctrl-BackSpace. Default is true  
    #AutoLogin1st=false  
      
    # Greeter config for 1st local display  
    [X-:0-Greeter]  
    # See above  
    #PreselectUser=Default  
    # See above  
    #DefaultUser=johndoe  

（4）、重启系统

[iyunv@xckydb ~]# reboot

（5）、查看177端口

[iyunv@xckydb ~]# netstat -na|grep 177

--XDMCP服务对应的端口为177

udp        0      0 0.0.0.0:177                 0.0.0.0:*
2. 使用Xmanager远程桌面

（1）、打开Xbrowser软件

（2）、进入Xbrowser后，会看到配置了177端口服务的机器自动识别出来了，双击打开，如下图：

（3）、弹出IP选择器，选择和虚拟机系统同IP段的IP地址，点击确定。

（4）、输入用户名、密码即可完成远程桌面登陆了，过程参考下面截图：



登陆后，远程桌面登陆成功，如下图所示：

至此，实验完成，实现了用Xmanager软件远程桌面LINUX系统的目的。