[KLUG Members] can't open display for remote X app

[John Pesce]

Hi,

I've encountered a wierd and unexpected X error. I guess I've been ssh
-X tunneling for so long I didn't notice until now. 

My older workstations that still run RH9 work as expected. I can xhost
nextbox, telnet or rsh from it into nextbox, set my DISPLAY to other:0,
and run xeyes.

All my other newer boxes are running Suse 9.3 or RHE have ssh and not
telnet or rsh. We just got a new HP unix box installed for a special
purpose app and it does not have ssh. 
On my RHE box I xhost +, and then telnet to the HP, setenv DISPLAY
RHE:0.0 and try and run the app. 
I get Error: Can't open display: RHEIP:0

I thought this was strange so I went to a Suse 9.3 box and tried to do
the same thing with the same error. Then I tried running xeyes on the
Suse 9.3 box and displaying it on another Suse 9.3 box, same error.

I don't have workstation firewalls. What gives?
Did X add some new feature to disable xhost +? 

I can xhost + on the older RH9 box and telnet to the HP and remote
display ok.