When running Totara on IIS, it is possible that you may experience 404 errors when using the report feature.
We have experienced this error in the past and I thought I would share the solution we found today. If you are running IIS you will need to install the URL rewrite module which can be found below:
http://www.iis.net/download/URLRewrite
(Note: this should come installed with the latest version of IIS)
Hope this helps,
Joe