Ok, I am freaked out. I set up a Filezilla server so me and a couple friends can access my music collection from work. The log was open and someone was trying to figure out the password of my users! I have no idea how this happened. It's only been up a few days. It's behind a firewall and it's running on Win 7.
Could my IP have been scanned even though I am using a private 192.168.x.x address?
What can I do to secure this so that it's hidden from anyone but who I give a username and password to?