Hostname Change Error

While staging to rebuild the Oracle DB Console (Oracle Enterprise Manager – OEM), I needed to check something in my MySQL instance and ran into the following error after changing the machine’s hostname for that OEM test. The message basically says that MySQL Workbench can’t resolve the connection.

The dialog error provides an excellent note, which lists the actual error as the first thing to check. The dialog follows:

This lists the text of the error dialog: