xdmcp connection possible from 32-bit to 64 machine?
 

For a while I was connecting on my LAN from a laptop running a 32-bit Slackware installation to a desktop running Debian Squeeze 32-bit. Since I switched to wheezy/testing amd64, my 32-bit laptop can't connect to the 64-bit Debian desktop. Do I need to re-re-examine my configuration or are 32 to 64 bit xdmcp connections not possible?

To be more precise, the desktop is broadcasting so I can see it on my laptop when I choose "remote login." I click to make the connection, the screen goes blank like it normally would, I get a mouse cursor, and then very quickly I get my local graphic login again. No connection is made. I can't find anything in Xorg logs to give me a clue.

But truth be told I haven't read them line by line. :) I grepped for the IP of remote machine.

I'm sure the 32bit to 64bit boundary is not a problem for the xdmcp connection.

What the problem actually is, is a harder question and almost certainly beyond my expertise.

In /etc/gdm3/daemon.conf I have this

'netstat -unl | grep 177' shows this:
udp6 0 0 :::177

So that means it's only listening on an ipv6 address? I thought it might be related to this bug report:
Bug#563406: [gdm] XDMCP remote login dos not work
So I've checked on mine... already set to 0.

sysctl -a | grep bind
net.ipv4.ip_nonlocal_bind = 0
net.ipv6.bindv6only = 0

My laptop is connecting from a different subnet on my LAN. (I'm connected to the desktop with a crossover cable) but I can't find which file to check to see which hosts/IPs are allowed. Xaccess is apparently irrelevant now because 'locate' doesn't show it on my system anywhere.

I think the problem is with my Slackware installation, I tried connecting via xdmcp with a desktop running Slackware 14.0 (using the crossover cable) and it worked. Then I remembered my laptop is running 13.37, not 14.0. I'll upgrade the laptop and report back here.

Of course it worked...