[TriLUG] trouble with xdmcp / gdm / xdm

[Ryan Leathers]

I found that my Solaris 8 machine which takes advantage of -broadcast
XDM by default is able to see and connect to my previously described
"target PC"
So, I now know that the target is configured correctly.  My "console PC"
can reach the target via ssh and launch remote xterms so I am now
focusing on its relevant config files to try and make it work like the
Solaris machine. 

-----Original Message-----
From: Ryan Leathers [mailto:Ryan.Leathers at globalknowledge.com]
Sent: Friday, February 21, 2003 10:52 AM
To: 'trilug at trilug.org'
Subject: RE: [TriLUG] trouble with xdmcp / gdm / xdm

One other thing - I shut off firewalling on both machines for now
-----Original Message-----
From: Ryan Leathers [mailto:Ryan.Leathers at globalknowledge.com]
Sent: Friday, February 21, 2003 10:46 AM
To: 'trilug at trilug.org'
Subject: [TriLUG] trouble with xdmcp / gdm / xdm

I can't get this to work and it seems like it should be easy to do.
I want to boot a PC running Redhat 8.0 to runlevel 3 (calling this my
console PC), then ssh to another PC running Redhat 8.0 (calling this my
target PC) and get xdmcp to give me a display through ssh back to the
console PC.
Here is what I have done following tips from the xdmcp howto...
On the target PC (a default RH8 install)
/etc/X11/xdm/Xservers - I added the line 172.16.128.64:0  foreign
(this is the console PC's address)
/etc/X11/xdm/Xaccess - I added the line 172.16.128.64  172.16.128.140
(this should "hard-wire" the two)
/etc/X11/xdm/xdm-config - I commented out the line
DisplayManager.requestPort: 0   (to permit xdmcp)
/etc/X11/gdm/gdm.conf  -  I changed the section [xdmcp] Enable=false  to
Enable=true

On the console PC (a default Redhat 8 install)
I have only changed the inittab to come up runlevel 3 by default

When I ssh to the target from the console I get connected and can launch
xterm's and so on - - this part works !
When I try this...
X -query 172.16.128.140 whether in an ssh session or not I see what
looks like a classic X display - black screen big X for a cursor -
nothing more.
If I ctrl+alt+F1 I see this message...
XDM: too many retransmissions
What am I missing ? ? ?

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