Apple Event: May 7th at 7 am PT

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

Level 1

1 points

10.6 update disables full duplex ethernet

Updated to 10.6 and immediately lost all internet connectivity. Network control panel reported "Cable Unplugged."

Restarted in 10.5.8 -- 100Mb connection worked fine.

Restarted again and back in 10.6, I fiddled with settings and found that by manually switching to "half-duplex" ethernet (under the "advanced" tab) internet connectivity returned. (Connectivity also resumes if I choose the "automatic" configuration, because that too switches over to half-duplex). Either way, the working connection seems a noticeably slower than 10.5.8, which I assume is the difference between half and full duplex.

Any ideas on how to restore the connection to full duplex?

2.66GHZ Dual-Core Intel Mac Pro, Mac OS X (10.6)

Posted on Sep 2, 2009 2:52 PM

19 replies

JonMalice Author

Level 1

1 points

Sep 25, 2009 9:28 AM in response to s2pac

Ah, sorry. I should have said: I used the program Cocktail to tweak my internet settings.

http://www.maintain.se/cocktail/index.php

Ethernet has been working fine ever since 🙂

s2pac

Level 1

0 points

Oct 5, 2009 3:52 PM in response to JonMalice

Much appreciated, that setting with Cocktail did the job, now back to normal.

phew... 😉

Oct 10, 2009 11:52 AM in response to JonMalice

This is NOT a cable issue (unless of course by coincidence you happen to have a cable that went bad =))

I Have a Mac Pro with two hard drives installed. I installed 10.6 onto my back up drive just incase something went wrong. My ethernet cable was connected to Ethernet port 2. After install and start up from the back up drive the port appeared dead and would not recognize the ethernet cable plugged into it (Cable unplugged message). I switched the cable to Ethernet port 1 and my internet, network, etc came back on. I switched back and forth between ethernet ports and kept getting the same result of a dead Ethernet port 2. I rebooted to my main hard drive and tested both Ethernet port 1 and 2 and they were both live and working normally. Even after updating the back up drive to OS X 10.6.1 Ethernet port 2 continues to show up as dead.

Oct 10, 2009 12:05 PM in response to JonMalice

UPDATE: I deleted my network locations in system prferences and created new ones. Everything appears back to normal. When I click on advance, and then the ethernet tab, it reports configure: automatically, speed: 100baseTX, Duplex: full-duplex, flow-control, MTU: Standard (1500).

10.6 update disables full duplex ethernet