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Old 07-13-2013, 01:23 AM   #1
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Registered: Jan 2005
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Unable to get Fullscreen X-windows connecting from a windows client

This isn't really that important to me but it is bugging me as to why it does not work.

I am trying to connect from PC1 to PC3 using Full screen X. BTW X does start on the main console.

My network can be simplified down to:

 PC1 Windows 7 ( --------|S
 PC2 OpenSuSE 11.4 ( ----|I
 PC3 OpenSuSE 12.3 ( ---|C
I have installed CYGWin and am attempting to use the 'C:\cygwin\bin\startxdmcp.bat' script to connect to the server. This works fine to connect to PC2 but just leaves a blanks screen when I try and connect to PC3.

It's been a couple of weeks of trying using google and I'm at a loss as to where to go with this now and thought I'd post here as a last try.

I can connect to both boxes using SSH connections to putty.

There are no IPTABLES rules on PC3:

 # iptables -L
 Chain INPUT (policy ACCEPT)
 target     prot opt source               destination

 Chain FORWARD (policy ACCEPT)
 target     prot opt source               destination

 Chain OUTPUT (policy ACCEPT)
 target     prot opt source               destination
Going through the XDMCP Howto I have the following settings:

# grep no-listen /etc/X11/fs/config
 # if you omit "no-listen = tcp" you can use xfs over the network
 #no-listen = tcp
#grep requestPort /etc/X11/xdm/xdm-config
! DisplayManager.requestPort:   0
# grep "any host" /etc/X11/xdm/Xaccess
*                                       #any host can get a login window
Now I'm not sure what to do here as my /usr/share/kde4/config/kdm/kdmrc file is coded as:

# Whether KDM should listen to incoming XDMCP requests.
# Default is false
but the working server is coded as

# Whether KDM should listen to incoming XDMCP requests.
# Default is false
which is at odds with XDMCP HOWTO. I tried both ways and it didn't seem to make any difference.

Then with file permissions:

# ls -al /etc/X11/xdm/Xservers
-rw-r--r-- 1 root root 738 Aug 23  2006 /etc/X11/xdm/Xservers
# ls -al /etc/X11/xdm/Xsetup_0
ls: cannot access /etc/X11/xdm/Xsetup_0: No such file or directory
They are the same on both servers (PC3 and PC2)

I presume that the XF86Config file is no lober used as I couldn't find it on my system.

Having done this I run 'C:\cygwin\bin\startxdmcp.bat' and just end up with a blank screen.

Any help would be appreciated. Even if it is just where to look.

Thanks for your time
Old 07-15-2013, 02:35 PM   #2
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You can turn on iptable debugging to make sure whether iptable policy is wrong.
Old 01-21-2015, 06:09 PM   #3
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Registered: Jan 2005
Posts: 24

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Could not getthis to work.

Eventually upgraded server from 12.3 to 13.2 and in /etc/sysconfig/displaymanager I changed:


and it worked.

Note: in /etc/ssh/ssh_config this was already set so I dont know if it was needed:

ForwardX11 yes

ForwardX11Trusted yes


windows, xorg

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