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Troubleshooting Wireless and Wired Connections Part 2 Next we look at intermittent connectivity issues and what cause them to occur. For example, what happens when a firewall is misconfigured and block network access, about confirming the NIC card works, issues with the TCP/IP protocol stack, and why good troubleshooting practices always begins with eliminating or ruling out the obvious causes such as loose cabling, unplugged devices and other hardware related events. You learn about issues on the ISP side of connectivity and their related issues such as what happens when the wireless key information is entered incorrectly.