Symantec and port scan attacks

Question

I have found many post on the port scan attacks created by Symantec on client computers, however it seems my port scan attacks are being blocked on the Spiceworks server side.  All the clients are showing up in spiceworks with no scan errors, but when logged onto Spiceworks server there is a port scan attack every few minutes from the clients.
This topic first appeared in the Spiceworks Community

Answer 1

No. While the encryption of your wireless network is mandatory to protect other people in your proximity to access your network, computers, internet connection or eavesdrop your computers it has nothing to do with port scan attacks. Port scan attacks originate from the internet. The router will block those unless you have configured port forwardings on your router or a computer opened ports on the router through UPnP. This is because your router does NAT which makes the LAN unaccessible from the internet.
Port scans are not really attacks but just the general "noise" in the internet. There is nothing you can do about it except not using the internet. As long as you don't have open ports there is nothing to worry about. And even if you have opened a port for instance for gaming it still depends on whether the program listening on that port is vulnerable or not.