Adding a custom named instance to Windows Firewall exception list

We install SQL Express 2005 with a custom named instance. Since a named instance uses dynamic ports, how can I add this named instance to the Windows Firewall exception list? Previously with MSDE 2000 we installed as default, then I added port 1433 to the Firewall exception list.

Is there a way to install SQL Express to a static port (programmatically)? Or, is there a better method, like adding the SQL custom named instance service to the firewall exception list?

You can add a firewall exception for the specific executable rather than the port number. Details are available in this KB Article,

Mike