Problem with client authentication with X Server

[DGeorgie at wiley.com]

Hi,

We are running J2EE application using local X Server to draw some images. 
The problem is that X Server is using magic cookies to authenticate X 
clients. On some occasions the magic cookie is invalidated and then the 
application cannot communicate with the X Server. In man pages for xauth I 
found that the cookie could time out. The default is 60 seconds. Our app 
could be down for maintenance longer than a minute so that explains why 
the cookie gets invalidated. When that happens the only thing we can do is 
to restart X Server first and then our app to resolve the connection 
problem.

Since our app is the only X client on the server I think it make sense to 
switch to host authentication for  X Server. How do I configure X Server 
to use host authentication?

f you think magic cookies are still better solution for X Server 
authentication please let me know how could we prevent their invalidation? 
I tried to use xauth to regenerate the cookies for the localhost display 
but with no success. 
xauth> generate :0 . trusted
Xlib: connection to ":0.0" refused by server
Xlib: Invalid MIT-MAGIC-COOKIE-1 key
xauth: (stdin):8:  unable to open display ":0".

Any suggestion is appreciated.

Unfortunately I was not able to find enough information on this topic, and 
the man pages don't help much. 

Thanks,

Dimitar