Here we go.
We’ll enable the firewall and as a start configure 3 rules
1. Allow your internal lan access
2. Allow your country (U.S. you said) access
3. Block everything else
You have located the firewall in control panel under security, right?
Go, do not check enable firewall yet and edit
Well I'm back for a bit. First 2 rules are created. Ready for #3 whenever you are. Off-topic question: I cannot access my NAS via my synology.me DDNS right now, but I can still access the mounted folders and can access via its direct IP address. How do I find out if the synology.me server is down right now?