My knowledge is pretty limited on the subject, and as a Sys Admin I'm by no means an expert in Cisco Firewalls. But, through a little self teaching and plenty of Google searches I've managed to set up an ASA 5550 on our network, and it's been running fine.
Now though, our circumstances have changed and I need to be able to take advantage of the AFP modules on the ASA 5550. I understand that I can only use ethernet or fiber on each port, not both. That's fine.
But when I try to change any of the GigabitEthernet ports to SFP via "Configure Hardware Properties" , I get the following error: