You have internet acces? if you don´t have internet acces the captive portal don´t show, make sure you have make nat and configure gateway
Many thanks for your suggestions, now it’s all right.
I set up the gateway ip, and now CP shows the login page when i try to connect to a website.
Then i enabled NAT on the external interface (for me is ETH01, I use ETH01 and ETH02).
Now the client can surf the web.
I’m sorry for italian speaking, I didn’t recognize of being on an english section.