When attempting to start the Mainframe Application Tuner (MAT) GUI why are we getting a 505 error?

Products

• Mainframe Application Tuner

Issue/Introduction

When attempting to start the Mainframe Application Tuner (MAT) GUI why are we getting a 505 error?

Environment

Release:
Component: MATUNE

Resolution

The client was running the GUI from http://<hostname>:nnnnn/mat11 

What occurred to us is that they should be running it from mat11/mat 

Running from http://<hostname>:nnnnnn/mat11/mat and they were OK.