Can't Access Named Clustered Instance With Management Tools on Remote PC

I have a two node SQL Server cluster with two instances of SQL server installed. From a remote PC I can access the default instance with SQL management tools but not the named one.

It's definitely a port/firewall issue as I can access the named instance with the firewall turned off.

On both nodes I have gone into SQL Server Config Manager and set a static port (11433) for the IP address for the physical NIC of each node and for the IP address of the virtual PC/network name that represents the instance (see below). I have also added firewall rules for port 11433 to each node.

I'm not running SQL Browser so, as I understand it, i must connect to a named instance using the following syntax tcp:clusterNetworkName,11433 but this does not work.

Any ideas

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