To verify a specific service is available from a service provider, first use the Network Utility Ping tab to verify basic connectivity. Then use the Network Utility Port Scan tab to verify the specific service port(s) are open. You should always limit the port scan to the specific ports required for the network service you're testing.

Four common issues that can interrupt network services on a Mac are:

• Ethernet connectivity issues, which can cause the hardware network interface to become inactive or introduce excessive packet errors

• Wi-Fi connectivity issues caused by the selection of an improper Wi-Fi network or excessive wireless interference

• DHCP service issues, which prevent proper TCP/IP configuration

• DNS service issues, which prevent

Migration Assistant can migrate information from other OS X systems, Windows systems, and other disks, including Time Machine backups.

Review Network preferences, review the Network Utility statistics, and attempt to connect to different network services.