CentOS - Oct 2005 - Can not get remote X connections to work on CentOS 4.1

I've encountered a strange problem in CentOS 4.1.  I've never had this 
problem before, and I've been using X Windows since 1990, but I can't 
get remote X connections to work:

   $ hostname
   host00
   $ echo $DISPLAY
   :0.0
   $ xhost +
   access control disabled, clients can connect from any host
   $ rsh host01
   $ xdpyinfo -d host00:0.0
   xdpyinfo:  unable to open display "host00:0.0"

Both hosts are running CentOS 4.1 and SELinux is disabled.  I know I 
can get this to wok with ssh, but that is not the point.  Also, it's 
not a host name resolution problem, as substituting the IP address in 
the above command gives the same error.  Finally, note that there is 
about a 3-4 second delay before the error message appears.

Any recent changes in X that I am unaware of?

Alfred

Alfred von Campe wrote:
> I've encountered a strange problem in CentOS 4.1.  I've never had
this
> problem before, and I've been using X Windows since 1990, but I
can't
> get remote X connections to work:
> 
>   $ hostname
>   host00
>   $ echo $DISPLAY
>   :0.0
>   $ xhost +
>   access control disabled, clients can connect from any host
>   $ rsh host01
>   $ xdpyinfo -d host00:0.0
>   xdpyinfo:  unable to open display "host00:0.0"
> 
> Both hosts are running CentOS 4.1 and SELinux is disabled.  I know I can 
> get this to wok with ssh, but that is not the point.  Also, it's not a 
> host name resolution problem, as substituting the IP address in the 
> above command gives the same error.  Finally, note that there is about a 
> 3-4 second delay before the error message appears.
If you are using gdm - try setting:

DisallowTCP=false

in /etc/X11/gdm/gdm.conf

James Pearson