XDMCP Configuration Help
 

I am running a Debian-based distribution of Linux. I have installed XDM through the package manager. I have installed Xming on my Windows PC downstairs. Originally, I configured XDM in the following manner:

In file: /etc/X11/xdm/Xaccess
I uncommented the line that says: "* #any host can get a login window"

In file: /etc/X11/xdm/xdm-config
I commented out the line that says: "DisplayManager.requestPort: 0"

I did these things per the instructions found at http://www.straightrunning.com/XmingNotes/IDH_XDMCP.htm

When I ran XLaunch, and selected the options:
"One Window" (Next)
"Open session via XDMCP" (Next)
"Search for hosts (broadcast)" (Next)
(Next)
(Finish)
I would immediately be presented with a login box/prompt. Entering my credentials would bring me to my standard X display as if I were upstairs physically logging into the system.

After some time, I uninstalled the generic video drivers and installed the correct ones from NVidia's website in order to get my sound working through HDMI. In this process I uninstalled and then re-installed XDM. Also, I swapped out the modem/router that I was renting from Comcast for my own separate modem and router. Prior to installing the drivers from NVidia, there was no xorg.conf in /etc/X11. Now there is, to ensure the use of the NVidia driver.

These 3 things (driver change, network component change, and addition of xorg.conf)are the only changes I have made. Now when I run XLaunch as described above, I get a blank window from Xming. I have run Wireshark to monitor the UDP traffic, looking for Query, Willing, Request, Accept, and Manage protocol sequences.

When I run XLaunch exactly as described above (i.e. using the "broadcast" method) I see no UDP traffic at all. If I use the methods of direct and/or indirect requests, I see Query, Willing, Request, Accept, and Manage; but nothing shows on my display on the Windows PC.

Seeing as I have set up the software on the Linux machine and never changed the settings on my Windows machine, I am at a loss as to why it will no longer work. I do not know if installing different drivers or changing the physical components of my network would really make a difference.

Any help or ideas would be greatly appreciated.