webMathematica™ Wolfram - Wolfram Research

webMathematica User Guide 179A second cause is that Mathematica cannot find its license and so cannot run. You can test forthis with the Check Mathematica test.Problems Running the Front EndCertain operations require the Mathematica front end, for example, the rendering of typesetimages and graphics or the use of any Mathematica notebook API functions. If you are runningon a Unix machine and using the X Window System, make sure you have studied the section onConfiguring for the X Window System.Problems Testing Xvnc (Unix only)This is only an issue for running webMathematica under the X Window System.As described in the section on installation, it is typical to run a virtual frame buffer X server,Xvnc, to run the Mathematica front end. If this does not seem to be running correctly (e.g.graphics do not work), you can query the running of the frame buffer by using the vncviewerutility.vncviewer :1You will need to enter the password for the Xvnc server, and then you will see a view of thescreen that the server provides. You should see the Mathematica front end running. If there areany problems, you may see dialog boxes describing the problems.Problems Testing Xvfb (Unix only)This is only an issue for running webMathematica under the X Window System.Xvfb is a virtual frame buffer X server that can run the Mathematica front end. If it does notseem to be running correctly (e.g. graphics do not work), you can query the running of theframe buffer by using the xwd utility.xwd -display :1 -root | xwudUnder certain configurations, this can be very slow. You can improve the performance by modifyingthe bit depth of the virtual server, for example, from 24 to 16. The following will run theserver with bit depth of 24.