Mac Pro - Problems with Your Internet Connection

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3

Click Diagnostics to open Network Diagnostics.

4

Follow the onscreen instructions.

If Network Diagnostics can’t resolve the problem, there may be a problem with the
Internet service provider (ISP) you are trying to connect to, with an external device you
are using to connect to your ISP, or with the server you are trying to access. You can
also try the steps in the following section.

Cable Modem, DSL, and LAN Internet Connections

Make sure all modem cables are fully plugged in, including the modem power cord,
the cable from the modem to the computer, and the cable from the modem to the wall
jack. Check the cables and power supplies for Ethernet hubs and routers.

Turn off your DSL or cable modem for a few minutes, and then turn it back on. Some
ISPs recommend that you unplug the modem’s power cord. If your modem has a reset
button, you can press it either before or after you turn the power off and on.

PPPoE Connections

If you are unable to connect to your Internet service provider using PPPoE, make sure
you have entered the correct information in Network preferences.

To enter PPPoE settings:

1

Choose Apple () > System Preferences.

2

Click Network.

3

Click Add (+) at the bottom of the network connection services list, and choose PPPoE
from the Interface pop-up menu.

4

Choose an interface for the PPPoE service from the Ethernet pop-up menu.

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Choose Ethernet if you are connecting to a wired network, or Wi-Fi if you are
connecting to a wireless network.

5

Click Create.

6

Enter the information you received from your service provider, such as the account
name, password, and PPPoE service name (if your service provider requires it).

7

Click Apply to make the settings active.

Network Connections

Make sure the Ethernet cable is plugged into your computer and into the network.
Check the cables and power supplies to your Ethernet hubs and routers.

If you have two or more computers sharing an Internet connection, make sure your
network is set up properly. You need to know if your ISP provides only one IP address
or if it provides multiple IP addresses, one for each computer.

If only one IP address is used, then you must have a router capable of sharing the
connection, also known as network address translation (NAT) or “IP masquerading.”
For setup information, check the documentation provided with your router or ask the
person who set up your network. You can use an AirPort base station to share one IP
address among multiple computers.

For information about using an AirPort base station, search for “AirPort” in Help Center
or visit the AirPort support website at www.apple.com/support/airport.

If you cannot resolve the issue using these steps, contact your ISP or network
administrator.