Linksys Cable / Dsl :: Wag300n Internet Is Not Available From Wifi Ap

I bought used Linksys WAG300N router from my friend.  Internet comes from Pirelli DRG-125AG to router. Incoming internet I connect to port 1, outgoing to PC - to port 2. Also I want to share Wi-Fi connection with my linksys router, but I got problem. I enable Wi-Fi, enter SSID, choose password, save changes, my phone connects to router, but says that internet is not available from this Wi-Fi AP. First time I connect Wi-Fi, it works good, but when I reconnect, that sh*t happens. I updated firmware to 1.01.07, restored factory defaults, but nothing changed. AP isolation disabled. Sometimes even after reboot, at first WiFi connection, I get same notification from my android.