Product:
Planning Analytics 2.0.4
Planning Analytics Workspace 30
Microsoft Windows 2016 Server

Issue:
When you in PA Workspace Administration Tool click on validate you get a error for TM1 Admin Server URI.

Error Message:
Error: connect ECONNREFUSED 127.0.0.1 443

Possible Solution:
The text you have entered in the field for TM1 Admin Server URI is not correct.
You have installed PA and PAW on a Windows server you have named DonaldDuck.
In the field you have entered:
https:/donaldduck.domain.com:5898

Note that you have missed one / at the https:/ point where it should be https://

Enter https://donaldduck.domain.com:5898 and test again.