Snow leopard- Ethernet does not work

1. Did you do a clean install or an upgrade?

2. Have you tried manually releasing your DHCP connection? (If you don't know how I can tell you how to)

3. Do you have a router? If so, have you tried plugging the ethernet cable into a different port?

4. Have you tried a different ethernet cable and/or one you can verify works?

 

Have you tried power cycling your cable modem? How are you getting wireless?

 

Possibly, but it could also be any number of reasons. I upgraded to SL and my ethernet worked fine out of the box, but I run through a router.

 

I upgraded all 3 of my macs on Monday to Snow Leopard. No problems on Tuesday but this morning I started having problems with the airport. I use one of my macs to share the ethernet to the other macs airports as of today that will not work even though it worked yesterday. I also noticed today when trying to figure out the problem that the wifi in the houses around me are at a much weaker signal now.

 

delete the SystemConfiguration folder

Library >> Preferences >> SystemConfiguration

Delete the SystemConfiguration folder to get rid of all the old plist files.

I did a clean install of Leopard and update with Snow Leopard on a Macbook Core Duo. Airport and Ethernet worked perfectly. Did a Snow Leopard update on an iMac Core 2 Duo with Leopard and lost the Ethernet.

Tried all the suggestions to reconfigure the network/reset router/change port/etc given in various forums to no avail.

Looked in the SystemConfiguration folder and there was a mess of plist files from various OS X updates.

Deleted the SystemConfiguration folder and rebooted. Works perfectly.

 

lost connection too

after upgrading, i have also been having issues with wired connectivity. wireless has been working fine. i will try to delete those pref files and see if that fixes things. what a pain it has been.

 

Thanks SO much for this tip! In my case Ethernet wouldn't work after upgrading to SL; Airport worked perfectly.

I copied the plist files in "SystemConfiguration" and saved (just in case), deleted the folder, shutdown and restarted. The Ethernet connection worked perfectly then. I had to go reselect my wireless network in System Preferences | Network to get the Airport connected again, but no biggee.

Thanks again huwon9!

 

Amen,

I just updated to iCloud and somewhere in the course of updating my wife as well and syncing my Ethernet connection stopped. I rebooted with an emergency backup partition and the Ethernet port work fine so I knew my hardware was okay Then I knew it had to be software and found this post and gave it a try and bingo, it worked. Thanks!!!

 

Worked perfectly in my case too. You rock!

 

LAN still not working after Snow Leopard update

Hi,

good information here. I also updated to Snow Leopard (from Leopard) and the ethernet and airport quit working. After trying various things (including deleting the plist files and rebooting), the airport is now working, but still no luck with the ethernet. In System Preferences >> Network, it shows that ethernet is connected. I work in a large office, so I'm a little reluctant to go ask our sys admin to turn off/reset the network switches/routers.

On the part about
Library >> Preference >> SystemConfiguration

There is no System Configuration on this computer. The plist files are all in the Preferences folder. I deleted all these (after backing up) and the airport worked after that. Need to get the ethernet working too.

Any suggestions? Why does everyone have the SystemConfiguration folder and it's not here?

Thanks..

 

You saved me hours of troubleshooting I'm sure. Thanks!

 

I also have no System Preferences folder and have this same issue. Did you ever find an Ethernet fix?