9 Replies Latest reply: Oct 12, 2011 8:17 PM by PJTank18
philravens24 Level 1 (0 points)

My Macbook Pro internet is not working. The airport appears to be working fine, it has an IP address and is connected, but DNS lookup is failing.

I have a time capsule as my router, verizon fios as my isp, and snow leopard as my OS.


Under the Airport settings, there are 2 DNS servers listed but they are both grayed out. Also there is one item listed under Search Domains, but this is also grayed out.

Macbook Pro 15"
  • Tesserax Level 9 (50,586 points)

    Grayed-out DNS IP addresses would normally mean that your MBP is getting its DNS IP addresses from the DHCP service in your router. Are these addresses what you expect from your ISP?

  • philravens24 Level 1 (0 points)

    Yes, they are the same ones that are on my other computers.

  • Tesserax Level 9 (50,586 points)

    Please try the following:


    System Preferences > Network > AirPort > Advanced > TCP/IP tab > Renew DHCP Lease


    This should "force" the DHCP client on your MBP to request a refresh of the IP addresses (including the DNS IP addresses) from the DHCP server in your TC.


    Please post back your results.

  • philravens24 Level 1 (0 points)

    Thanks, still nothing though.

    Is there any other information that I can give you that may help?

  • Tesserax Level 9 (50,586 points)

    It may be possible that you have a corrupted network-related .plist file.


    One quick test is to move the SystemConfiguration folder to your desktop, and then, restart your Mac. This folder and its contents will automatically be rebuilt by OS X to their default values, which will require you to reestablish your wireless connection again. If this fails to resolve the problem, you can simply move the folder back to it original location.


    You will find this folder in the following location: Macintosh HD > Library > Preferences

  • akreid Level 1 (0 points)

    I was having the same issue and tried this, and it fixed my problem. But now there is a new SystemConfiguration folder in the Preferences folder as well as the one on my desktop. Should I remove one of the folders? I can't move the one from the desktop back to the old location without replacing the existing folder, which I'm not able to do.

  • Tesserax Level 9 (50,586 points)

    If this solution fixed the problem for you, you can just go ahead and delete the SystemConfiguration folder from the desktop.

  • akreid Level 1 (0 points)

    Great--thanks so much for your help!!

  • PJTank18 Level 1 (0 points)

    I am having a similar problem, but it happened after I had the RAM of my new MBP running 10.6.8 updated from 4g to 8. The computer screams but won't do anything on the Internet. When I use the network diagnostic, it shows green up until the Internet. I know the Internet bc I am using my iPhone to post this. Thanks for your help.