Ethernet has a self-assigned IP address and will not be able to connect...

Changing the ipv6 isn't working for me even though the icon is green and it looks like it's connected. You still can't get through to the internet. Will try fixing the ip.

"I adjusted the "Ipv6" option to "local-link only" in the Network settings, after clicking on the ethernet connection."

Thank you, renatafromsan francisco! This solution worked!

I tried a few solutions I found here and on other sites. Not sure exactly which step fixed it, but I'm up and running now with no self-assigned IP address issues. Note, my setup also has a Powerline ethernet adapter that's plugged into my wall outlet and acts as an ethernet port. Here is what I did:

1. Go to the /Macintosh HD/Library/Preferences/ folder and remove the file called "com.apple.alf.plist." (as stated earlier in this thread)
2. Do what is listed in post 154 here: http://forums.macrumors.com/showthread.php?t=384947&page=7
3. Restart router, then computer. Now if you have a powerline ethernet adapter like me, unplug/replug it.
4. From the Network section of System Preferences, delete your "Ethernet" service entry by clicking on the "-" sign. Now click on the "+" sign to create a new Ethernet service.

Your new Ethernet service should be green and have it's own IP address.

Hi Guys,

Simply answer.

I delete all of other not working network options and only leave the Wifi on.

Turn the ethernet back on with default.

Back work as normal, no problem.

Tried what you advised. The 154 post did not work for me, since it could find flush command.

I've tried a good number of the other avenues and had come up empty until I did the following:

1. Network, uncheck passive box under proxies for ethernet.

2. Plug in ethernet. Reboot router with ethernet still plugged in, and then got a green ethernet that i'm using right now to post this.

I tried unplugging and plugging back in and restarting router with it unplugged, but it then worked when plugged in a rebooted router.

Just saying that something actually ended up working.

I used the first of those router numbers and entered it in the "Router" field when I had configured the IPv4 as "Manual". This fixed the problem for me right away. My computer had generated some useless IP address and then as soon as I entered the router number, it went right back to the correct address and started working.

Same problem: self-assigned IP address. Turns out my Firewall settings (in Preferences / Security / Firewall) were the problem. I turned off my firewall and ethernet came back immediately.

Sorry but this did not work for me

I was having problem with my Wi-Fi connecting to the internet despite all the usual tricks. I read your response and tried it and it worked. Thanks you much!

Divines bless you kind sir

System Preferences > Network > Advance > DHCP, then click "Renew DHCP Lease" could solve the problem.

Thank you. This worked for me on 10.9.5. The subnet mask had defaulted to 255.255.255.0 instead of 255.255.0.0. After fixing that and then manually entering an IP and router address, everything started working again.

Been troubled by this problem since I bought my Macbook last year. Just stumbled on a solution for my problem that makes no sense, but I'll take it.

In the Network panel under Location, "Automatic" never worked, so for a year I set the DHCP manually. I just monkeyed around with it tonight and found that if I create a second, new "Automatic2" (or any name) under Location it works great. It automatically find an IP address just like "Automatic" should. All settings in Automatic and Automatic2 are identical except Automatic2 works and the factory Automatic doesn't. Go figure.?

Hope this helps someone else.

Didn't work for me. Icon changed from yellow to red.

After close to 6 hours of resetting, configuring, calling comcast etc. I found this that totally solved my problems on the computers I have attached to wired internet.

1. Open a terminal window

2. type cd /Library/Preferences/System Configuration

3. type open .

4. Find the NetworkInterfaces.plist

5. Trash it

6. Restart your computer

7. Go to Network and it will automatically find your wired connection