Resolve error "The following remote server and its associated services and stages are unavailable: " in Spectrum Enterprise Designer

Product Feature: Installation / Upgrade

Issue

When launching Spectrum Enterprise Designer, we see the following error:
 
User-added image

The following remote server and its associated services and stages are unavailable:
<servername>

Cause

The server referenced in the error has been set up as a Remote Server under Management Console, but it is unavailable.

Resolution

UPDATED: October 18, 2017
Log into Management Console > Remote Servers and confirm that the Remote Server referenced has the correct Host Name and Port Information.  As well as that Spectrum is actually running on the Remote Server.