I don't know what netstat is supposed to accomplish, but don't overcomplicate things here. Start from the ground up.

Do you have DSL or cable?
Have you unplugged your modem for 5-10 mins lately? Do you do that once a month?
If you use a router, unplug both it and the modem. Then plug modem in after 5 mins and let it get setup. Then plug in router and let it setup. Try connection now.