1. Diagnose the NIC
   • Use control panel if available to see if it's working
2. Check your NIC's driver. Replace if necessary
3. Diagnose locally
   • ping neighboring systems by IP/domain
   • If using NetBIOS run net view
4. Check IP address and subnet mask
   • Make sure IP address and subnet mask are entered correctly
   • If you're on DHCP, try renewing the lease.
5. Run netstat
   • Checks current connects to the system
6. Run netstat -s or netstat -b
7. Diagnose the gateway
   • ping the router, both local and public IPs
8. If you can't ping the router it's down or you're not connected.
   • If you can only ping the near side, something in the router is messed up.
9. Diagnoste to the Internet.
   • If you can ping the router, try to ping something on the Internet.
   • If you still can't get through, run a tracert or traceroute to try to diagnose where the issue is.