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

Document ID : KB000014518
Last Modified Date : 14/02/2018
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Question:

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

Answer:

The client was running the GUI from http://ourhostname:51914/mat11. 

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

When CA ran with just mat11 we get a 500 error. 

The client tried running from http://ourhostname:51914/mat11/mat and they were OK.