Originally posted here by AngelicKnight
This appeared in the firewall log shortly after my Nmap playing:

Does this explain the lost Internet connection?
Yep, you maxed out the connection pool on your firewall (not sure if that is EXACTLY what they call it but a firewall expert here will chime in if no). I've had the same problem when doing scanning from home to my work sitting behind a consumer firewall...not to mention my home ISP blocking/filtering ports!