That will depend on how your guest access is configured. If you're only using Aerohive firewalling, you'll need to modify the firewall policy to permit traffic to the device, subnet, etc. If you have your guest access configured on a separate vlan and subnet, perhaps firewalled, there will be more hoops to jump through, including routing, holes punched in your firewall, etc.
Feel free to add some detail if you'd like more input.
