Self assigned IP address

Improper wifi settings in the router are frequently the problem. When I worked for Apple Retail we always tried to own the problem and solve it, not blaming the router. But the router was often the problem. For example, if you are having the problem at home, but not at Panera Beard or Starbucks or the Apple Store, then the problem is your wifi router.

Hi This solucion works for me. Its pretty simple as create a new location.

Take a look to this tutorial video:

http://www.youtube.com/watch?v=dMxD9Bh7brk

Another possible solution if other things dont work.

Just went through many steps listed to figure this out and depending on folks situation it can also be caused by the router. I found that in my situation for a business that the DHCP on the wireless router was set to only except addresses from (example) 192.168.10.1 - 192.168.10.10. With that configuration only 10 people could get on that router unless it was changed to say 192.168.10.1 - 192.168.10.100 (now it has room for 100 people). .Once the business hit the initial 10 that was set originally by ISP (provider) nobody else was getting on.

All I can say is "WOW, that was FUN, NOT". Hope this will help somebody else in need if the other steps posted earlier didnt help.

TFCTECH

I tired everything and still it doesn't work. So I turned off the modem for 1 mintute and than turned it on. My internet is back!!! So easy but I took me 4 hours to figured it out and made me so worried and upset!!!

YES!!! Worked. The Best.

This did the trick for me too! Glad I found this thread after only a few hours, not days.

Thanks so much for posting the solution to delete that network password in the keychain file.

I had this problem and was able to fix it by deleting the network from my list of preferred networks and its keychain password. Then the network was recognized as new and seemed to reset itself once I entered the WEP password.

I tried all of the other solutions on many forums over many hours and this is the only one that worked for me.

this is the only solution that worked for me.

This just worked for me! After a week of reading discussions and realizing that my iphone5 and original ipad were finding the network but not the imac, I tried ericdy procedure and it worked. Happy New Year!!!!!!!!!

Thanks to candilyn18

Worked at last!

hi ericdy, i read your post.

i use a public network most of the time and it does not have a password. So there is noting to delete in keychain access. I have a mac book air, i only connect through my wifi. Can you please help me out. Thank you

I was stuck on this for days and days running both a netgear wifi/cable modem and Dlink wifi/cable router - which basically conflict Ip addresses to which i had to manually set different IP to the Dlink, which didn't solve the problem just yet. As my Dlink's wifi I had access to very easily just not a very fast connection, But my netgears wifi I couldnt connect via airport only by ethernet.
I tried everything from...

renewing the DHCP lease
Deleting the Keyaccess

Revoming the wifi preference in advanced settings

Turning off my Dlink & Netgear
Reset the Dlink
*couldn't reset my Netgear as last time i reset it got stuck on reset for two days.*
Deleted my airport plist in MacHD

creating a new location
Manually inputting an IP address. (which said was connected but no internet connection)

& Changing both my pass to WPA2-PSK

& I'm pretty sure I tried that all in many different combinations and still didn't reslove my issue.
Today I was planning to call apple and spend that $50 that I don't have and see what their solutions were.

instead I thought I'd try one last time to fix this, Here's what I did - and I can't say that it will work for people unless you have two routers, but it may work with just one, either way my previous methods above may help someone fix theirs!

I basically switched off my dlink and was about to directly plug the ethernet cable into the Netgear and all of a sudden I had a wifi signal that worked - browsed the net for a solid 30mins - onwards, switched on the dlink and my airport still stayed with its connection and I saved as a new location.

I'm no guru all my methods were stuff I found searching forums and just trial and error runs, I think what may have happen and someone please correct me is that maybe the two networks were getting confused with each other I did noticed that my netgears subnet mask ended with 240.0 instead of 255/250.0 which was what the dlink entered in. Originally when i tried connecting the first time the subnet on the netgear tried picking up at 255.255.0.0 which was strange as i was used the the 240.0 So turning the Dlink off must of made the netgear re-register its sub?

Anyway I hope my solution helps someone out! or maybe someone can give me some good feedback on why my issue might have occured and maybe a better solution to fix this problem next time!

Thanks!

Thanks for the suggestion! I didn't quite go in the exact order you described, but after renewing it about 4 or 5 times it finally picked up the proper dynamically set IP.

This happens to me occasionally and this is the only thing that has EVER worked!

This worked for me after all the above posts. I did #4 and #5 and I was set. I didn't have access to the router to reset to factory bc I am house sitting. Glad this worked!