[SunHELP] Error: Can't open display: unix:X11

[Richard Skelton]

Hi,
I have upgraded our Citrix server from Solaris 9 to 10 U8 on my V490 and 
install all patches from Dec/01/09
A few of my users after a week of usage are seeing "Error: Can't open 
display: unix:X??" where ?? is there display number.
If I change the DISPLAY environment :-
setenv DISPLAY localhost:11.0
They can now start new X applications.
If I set DISPLAY back to unix:11.0 they can't start new X applications
The socket perms are the same as other users:-
 > ls -l /tmp/.X11-unix/X11
srwxrwxrwx   1 root     ctxadm         0 Feb 26 13:45 /tmp/.X11-unix/X11=
my /etc/system is :-
***********************************************************************
 set maxuprc=1024
***********************************************************************
* GigaBit fixes
set sq_max_size=200
***********************************************************************
set rlim_fd_max = 1024
set rlim_fd_cur = 256
***********************************************************************
set hires_tick = 1
***********************************************************************

How can I fix this problem

-- 



Cheers

Richard Skelton
Richard.Skelton at infineon.com
Infineon Technologies UK Ltd
Infineon House
Great Western Court
Hunts Ground Road
Stoke Gifford
Bristol
BS34 8HP
Tel +44(0)117 9528808