not getting login using xdmcp

[Andrew DeFaria]

Harold L Hunt II wrote:

> Andrew,
>
> Andrew DeFaria wrote:
>
>> I have a similar problem. This is with a SuSE 8.2 installation. I had 
>> Mandrake 9.1 installed before and managed to get XDMCP working. Can't 
>> get it working with SuSE however and I'm pulling my hair out!
>>
>> I have nothing in my /var/log/messages nor /var/log/kdm.log files. 
>> I'm using:
>>
>> $ xwin -query sonslinux -from adefaria
>>
>> X comes up but no login dialog box. XWin.log is attached.
>>
>> Any help would be appreciated.
>
> How many network interfaces do you have?  

1

> Find out the IP address of the interface that is actually 
> communicating with sonslinux and make sure to specify that IP address 
> in the -from parameter.  If you give it the wrong IP, it will cause 
> the XDM serve to be unable to send messages back to XWin.exe

Retried it with my IP address. Same problem.

>> XDM: too many retransmissions
>
> This is your key log message from XWin.log.  The XDM support in 
> XWin.exe is generic to all X Servers, so you can google for this 
> message and try to find some help there.  My guess is that you either 
> have a problem with the return address being incorrect (as I talk 
> about above), or one of the following:
>
> 1) You have not enabled an XDM server on your Linux machine followed 
> by a restart.

I have (an aside, my understanding is that XDMCP runs on port 177. I try 
to telnet to port 177 and get connection refused. Guess this is not 
good). As you probably know XDMCP is not enabled by default. I have 
changed the config files to allow it (at least I think I have) and have 
not only restarted kdm but have rebooted the machine to no avail.

> 2) You could also just not be running you linux machine at the correct 
> run level, which would cause the XDM server to not even be started.

Sonslinux sits right next to me. I am logged into a kde session right 
now so I assume I'm at the proper run level.

> 3) You have not enabled remote XDMCP connections for the XDM server 
> that you are running (followed by a restart):
>
> http://xfree86.cygwin.com/docs/faq/cygwin-xfree-faq.html#q-mandrake-8.1-xdmcp 
>
>
> NOTE: The fact that the above link says "Mandrake" can be ignored... 
> it was originally written when Mandrake started defaulting XDMCP to 
> being disabled, which was closely followed by my realizing that almost 
> all distributions started doing this.

Yes. Let me read that and see what I find... (BTW this page answers my 
soon to be next question of why I can't XDMCP to the Solaris box - Need 
to use a font server! Thanks. BTW that XWin.log file may have been from 
my attempt to XDMCP to the Solaris box. I've attached a new XWin.log).

Enabled XDMCP in /opt/kde3/share/config/kdm/kdmrc (SuSE 8.2 - it's not 
listed in your table -perhaps you would like to update that).

Note I also found the following in /etc/X11/xdm/xdm-config:

! SECURITY: do not listen for XDMCP or Chooser requests
! Comment out this line if you want to manage X terminals with xdm
!
!DisplayManager.requestPort:    0

And as you can see I have commented that out. Both of these actions I 
have done a few days ago and have since restarted kdm and even rebooted 
sonslinux but the problem remains. This is why I'm pulling my hair out!

Additionally I made sure the following appears in 
/opt/kde3/share/config/Xaccess and /etc/X11/xdm/Xaccess:

# 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

Oh, BTW your link for Linux XDMCP HOWTO 
(http://www.linuxdoc.org/HOWTO/XDMCP-HOWTO/) when clicked yeilds:

Note:   You are trying to access The Linux Documentation Project website 
using an old (and unsupported) URL. Please update your bookmarks to use 
www.tldp.org <http://www.tldp.org> or en.tldp.org <http://en.tldp.org> 
(if you just need the English documentation). Click to go directly to 
the page you requested: http://en.tldp.org/HOWTO/XDMCP-HOWTO/
-- 
A truly wise man never plays leapfrog with a unicorn.
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