X config RH 3

[Nigel Wade]

Yard, John wrote:
> SSH is not in the picture. We are using the pc Hummingbird 
> client, another admin says he remembers commenting out  
> a line from an X config file , and then being able to
> connect using xdmcp . 
> 
> Has nothing to do with xhost, I've tried all 
> variations.
> 

Normally the X server doesn't listen for XDMCP, or any other connection 
for that matter.

You have to setup gdm to accept XDMCP requests. For RH4 this is in 
/etc/X11/gdm/gdm.conf, I don't know how RH3 XDMCP was configured.

On the Windows (I presume it's Windows as you mention Hummingbird) 
client you need to be sure that the client firewall is not blocking the 
X ports. Depending on how you configure any firewall on that client this 
may be an issue. Check the firewall. At the very least you need to be 
able to receive connections on port 6000 originating from those two 
machines. Without that the XDMCP login screen can't be posted. Also 
check that the firewall isn't blocking outgoing connections to the XDMCP 
port, 177, on those machines.

-- 
Nigel Wade, System Administrator, Space Plasma Physics Group,
             University of Leicester, Leicester, LE1 7RH, UK
E-mail :    nmw at ion.le.ac.uk
Phone :     +44 (0)116 2523548, Fax : +44 (0)116 2523555