Aginity Workbench Redshift Server Connection Error

I've downloaded Aginity Workbench for Redshift, version 4.3.

I'm receiving the error message, "The Connection is not open"

I selected my server endpoint by using this document: http://ift.tt/1BzkFy1

example from link: examplecluster.userid.us-west-2.redshift.amazonaws.com

Port is 5439

I noticed right away that I could select a database from the dropdown. If I supply the database name I still get the error message "The connection is not open", does anybody know what I'm missing? Thanks.