The kernel (software) on your router is letting you know that somebody tried to connect ('intrude') to your WAN IP address.
This happens all the time, entire botnets are dedicated to trying to connect to random IP addresses at certain ports to try default user/password combinations to see if they can find weak security somewhere. However because the router denies this, there is no problem.
Your problem is you cannot connect to the internet this could be faulty router / faulty line / ISP server down.
how are you connecting now?