Test if XMLA connection is working

I am new to Pentaho - I normally use the Microsoft stack but a client has asked me to investigate if open source options are feasible for a forthcoming BI project.

I have installed the community edition of BI Server (5.0.1) on a Windows server box and not changed any of the default settings.

I have built a simple cube in Mondrian to take data from a MySQL database. I can view the cube using the jPivot View option in the user console and drill down on dimensions and it seems to work well. I would now like to view it by passing an MDX command to it using PHP. The intention would is to build a web service that can be called by a range of technologies such as Flash to display the contents of the cube.

I have been trying to use OLAP4PHP to view it, but I am getting an error message saying I cannot connect with an HTML error 500. I understand OLAP4PHP requires an XMLA connection.

If I try and view the URL in a browser (I am looking at http://myserver:8080/pentaho/Xmla), I get a 405 error saying GET is not supported by the URL.

The first thing to do would be to make sure the XMLA connection is working. How can I test if the XMLA connection is working and what can I do to troubleshoot any problems?