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  1. #1

    Member Since
    Jan 21, 2012
    ISP Failure on MBP, Success on Mac Mini

    I'm having difficulty troubleshooting a problem with my MacBook Pro's network connection.

    Here are the network statuses:
    Airport - Green
    Airport Settings- Green
    Network Settings- Green
    ISP - Red
    Internet- Red
    Server- Red

    When I try the network diagnostics, I get this page:
    Network Diagnostics cannot fix the current networking problems.

    Check with your Internet service provider or network administrator and make sure you are using the correct network settings.

    I am using my university's internet, and they are vague in giving out who is the exact ISP.

    What's really strange is that my Mac Mini's internet seems to work just fine, and it uses the same airport for its wifi service. Here are the specs for both machines:

    MacBook Pro:
    Mac OS X Version 10.6.8
    Processor 2.33 GHz Intel Core 2 Duo
    Memory - 3 GB 667 MHz DDR2 SDRAM

    Configure IPv4: Using DHCP
    Configure IPv6: Automatically

    DNS Servers:

    Mac Mini:
    Mac OS X Version 10.7.2
    Processor- 2.5 GHz Intel Core i5
    Memory- 8 GB 1333 MHz DDR3

    Same TCP/IP and DNS Server specs as the MBP

    I've deduced that the airport's probably not the problem since the mini's not working, and the ISP's probably alright too for the same reason, so I'm not too sure what's acting up :/

  2. #2

    Member Since
    Jan 21, 2012
    Also, I've just tried out plugging the ethernet cable directly. That doesn't work either. :< Is there a virus or something out there that blocks the Internet?

  3. #3

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac i5 2.7GHz, 16GB memory, OS 10.11.1.
    No but there is a DNS Changer Trojan. If the DNS is different from the Mini download the Tool and run it.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  4. #4

    Member Since
    Jan 21, 2012
    Unfortunately, that isn't it either. The DNS are identical. I just pinged my MacBook Pro's IP address and it sends back packets- makes me utterly befuddled... I'm hoping I'll learn something in my current networks class that will let me solve this strange problem.

    Also, another update: I manually changed my IP address and made sure it was available. The new IP address also sends back ICMP packets when my mini pings it. Now when I run the diagnostics, it says my Internet Service Provider works now, but my Internet and Server doesn't! :< I'm really confused why the internet's being blocked when the computer's so obviously connected to the network!

  5. #5

    Member Since
    Jan 21, 2012
    This issue is RESOLVED.

    Apparently my school's proxy was getting in the way, but wasn't working properly and asking for authentication when it should have. I reset the proxy settings and also changed the DHCP settings back from manual to automatic and applied the settings- and the proxy finally kicked in again. (At the very least, from what I know I think it's a proxy... but I could be wrong).

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