Self assigned IP address

I've had the same issue and tried all of the described methods to no avail. Then I've found mentions of firewall blocking airport from obtaining ip address from dhcp server here and here and it was it. Basically what I did was:

1. turn firewall off (allow all connections);
2. turn airport off;
3. turn airport on - see how ip address is properly get;
4. turn firewall on.

Hope it helps.

I had the same problem on mac lion 10.7.4.

The solution mentioned in this thread didn't help.

Then I solved it with a Keychain repair. Before using Keychain, I turned the wifi off.

1. Open Keychain Access

2. Select the "Keychain Access" menu item.

3. Select "Keychain First Aid"

4. Enter your password, select "Repair" and click "Start".

After completion, I turned the wifi back on again and my mac was able to connect properly to the network.

Hope this helps.

My situation is slightly different, in that I use my Mac as my wifi router via my Airport. So, my Mac is connected to internet via ethernet, and then I have airport turned on and my other devices connect to internet through the Mac. What is even stranger was that I was ON the internet on my PC when suddenly I could not connect to the internet anymore. So, it was working one moment, and then not working the next.

I have tried all the fixes listed in this forum and everywhere I can find on Google and in Apple support, but nothing works. I am running OS10.5.8. It is very discouraging to read about such an extensive problem that has no real solution. Has anyone come up with anything new in the last week, since the last post here?

Sheri

Thank you Ericdy,

a solution that works.

x Craig

Thank you very much,

This solution fixed my problem!

I've tried all of these suggestions and I stil can't connect

None of the suggestions have worked for me either, still have the self assigned error.

Has anyone updated to Mountain Lion to see if that fixes it?

Hi

I am running 10.7.4 and my MacBook Pro won't get any IP address via DHCP on wifi.

If I reboot into win 7 boot camp wifi works fine.

I have made sure the firewall is off, I've cleared the keychain, set the DHCP ID, tried connecting to differemt routers and networksetc.

If I set an address manually things work, but its very difficult guess DNS server addresses.

Its just like the dhcp service on Mac OS X isn't working.

Extremely frustrating. If I admit defeat and go to an Apple shop and talk to one of their techs I will get even more frustrated as they never know how to fix any thing even slightly technical - in my experience.

Please help. I was in the middle of downloading Mountain Lion too when it stopped working. Started downloading at work, came home and no more DHCP.

Liam

As an update to my issue.

It would seem DHCP ( & possibly DNS too) is totally dead for my user account.

If I run nslookup and manually enter a known DNS server IP address to query for hostsnames - no results come back - it just times out.

If I start as the Safari user then i can logon to wifi and get and IP address fine. It also works fine from a Boot Camp OS and if I set a Virtual Machine in Fusion to bridged networking it can also get a DHCP address.

At the moment I have a feeling a file permission could be broken - but I've run the verify and fix permissions in Disk Utility which did not help. I've run a disk check this morning and no errors were found.

********* Odd thing just happened, right this very second, as I'm typing this message inside a Windows XP Virtual Machine running on my 'broken' Mac OS. It has all started working again ... extremely bizarre.

DHCP works - DNS works. The world is good again. If I get to the bottom of the problem I will post an update.

Liam

i am one of the many hundreds victims of this unbelivable nigthmare "self assigned ip" who finally got a solution with this trick.

Hope this work for others as well. By the way .. do you have an explanation for this lack of serious answer from Apple???

best regards

Which solution was that?

Hi,

This did the trick.

I was getting self-assigned ip addresses on Airport as well as on Ethernet.

romache wrote:

I've had the same issue and tried all of the described methods to no avail. Then I've found mentions of firewall blocking airport from obtaining ip address from dhcp server here and here and it was it. Basically what I did was:

1. turn firewall off (allow all connections);
2. turn airport off;
3. turn airport on - see how ip address is properly get;
4. turn firewall on.

Hope it helps.

Thank you very much !

Peter

I have the same problem as well. I have tried everything as you have to no avail. I interested to see if you have made progress at all.

Sorry, meant to clarify that my post was directed towards mrninja

Hi dman083.

I have progress in that it randomly started working.

Unfortunately it started working before I could trace the source of the problem. Except that I'd narrowed it down to my user account.

Try rebooting to your 'guest' / Safari account and see if you can attach to the wifi and get on the Internet. At least that proves that the Mac OS install is functional.

If that works I have seen some people advocate creating a new user account and migrating your data across. I wouldn't do that though I'd rather track down the problem.

Also try a hard wire network cable and see if you can get an IP via ethernet. I'd be interested to know if this does or doesn't work, while the problem is manifesting itself, as this would help track down where the issue is.

Liam