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Unable to connect to X11 window server?

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The Question is:

I am running alpha vms7.3-1, java 1.4.0, apache webserver, tomcat servlet engine
I have built a web app on a windows pc using davisor graphics display utilities
 and it works fine.
Transporting the .WAR to the alpha, all of the none-graphics parts work ok, but
 when trying to display a graph, the browser (I explorer) gives a "502 Gateway"
On examination of the localhost logfile within apache/tomcat, the following
 dump is shown:
javax.servlet.ServletException: Can't connect to X11 window server using ':0.0'
 as the value of the DISPLAY variable
I have searched all over for an explanation of what this means and how to
 remedy, but without success.
Can you help?

The Answer is :

  The application appears to be selecting the display target using what
  appears to be an IP transport syntax :0.0, meaning the TCP/IP Services
  IP transport for DECwindows is required.  Please see the OpenVMS FAQ
  for details on connecting the DECwindows TCP/IP transport.

answer written or last revised on ( 30-DEC-2003 )

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