Hi there,

I've set on "hidden" two SSID on two Groove but I've seen many connection with traffic.
I'm using Groove A2Hn connected to RB1100AH.

Why?

Hidden doesn't mean it can't be found...
Look at traffic and the connection and you'll see who is on it.

I know it!
Does it possible that device wich know SSID could connect even SSID is hidden at this moment?

Yes, there are tools to know the ssid, if you want to connect only 1 or more stations, i suggest unchecking the "Default authenticate" and put manually your stations Mac address on the access list.

This will only let auth and connect the macs you listed. Even this way is possible to get it. The best way to secure your network its using WPA2 + AES.

REgards