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To create the cluster as pictured above, first install SQL Server on both the active, passive, and witness hardware. The active and passive instances must be at least SQL Server standard edition, and the witness can be the express edition. Ensure that the Sql Server Management Studio is included in each installation. You must ensure that each SQL Server instance is configured to allow connections via the network (ie, firewall, surface configuration).
Install Primary Connexion
Install Connexion on the primary / active machine and during the installation configuration, point it to the SQL Server instance installed on the same machine (the primary / active). The next step is to install Connexion on the secondary / passive machine and during the installation configuration, point it to the SQL Server instance installed on the primary machine.
Please watch the following video on initial configuration of a cluster: