Check for server vunerabilities using a free web

We have many Windows Server 2008 R2 servers that host systems, and recently had been getting lots of failed logon attempts, so it was imperative that we investigated not only the source, but how to prevent them even trying.This is a fantastic free web-based utility that scans the computer it is running on.https://www.grc.com/x/ne.dll?bh0bkyd2