You should also look at the other network tabs such as Wi-Fi, and check that the network you want to join is shown in the list. The reason is that in OS X Lion there have been some reports that manual configuration causes issues (though this may only be with early versions after the OS was first released) Set TCP/IP to DHCPĤ. The first thing to do when you’re experiencing WiFi problems is to check and validate your network settings in System Preferences to make sure everything is setup correctly.ġ. Open System Preferences and select the Network icon, which is in the Internet & Wireless section Open the Network settings in System PreferencesĢ. Click the Advanced button at the lower right to view more details about your network connection Click the Advanced button to open up more optionsģ. Under the TCP/IP tab, under most circumstances you’ll need the Configure IPv4 item set to Using DHCP.