AirPort gone crazy after 10.5.3

Same here - Rescanning for networks "solves" the problem but connection gets lost every 20-30 sec. Worked all fine before the updates. My Iphone and ipod touch and even the Vista Notebook keep on surfing for hours on the exact same desk.

I hav e a brand new iMac with 10.5.4 The issue you speak of is much worse. I have no connectivity (wirelessly) to the net during peak hours (between 5 am - 1 am).

That's really bad. Glad to hear I am not the only person experiencing this troubles.

I'm posting this on a couple of different threads to get the word out.

Here is an interesting twist. I loaded Windows Vista Home Premium using BootCamp today. Surfing the internet on the same iMac using Windows explorer is 3-4 times faster than using 10.5.4 and Safari. Same hardware, different software and the wi-fi connection is steady at full strength with no drop offs and web pages load as fast as the rest of my PC computers in the home.

Me too. 2 macbooks at home frequently/randomly won't connect to airport extreme, a ppc imac doesn't have a problem. An intel iMac i have at work set up as a wireless access point is visible to my macbook and other's pc's, but the connection always time's out and drops ever since the most recent update, nothing can connect to it anymore. I have recreated my network at home and work, One of my macbooks at home just had a new drive put in with a clean install,,,,,, same thing.

I am using 10.5.4 and my airport is unstable as well...

My iMAC is 1 week old. I also have windows XP pro and was working fine till 2 days ago when it started to loose signal (but much less frequently than the Leopard) and whenever I repair the whole thing freezes that I need to switch off the computer using the power button.

I just can't figure out what's going on with my iMac's Airpot, dropping connection after 10 seconds and sometimes can't even turn it on from System Preferences/Network. I even tried with a USB Wireless Dongle V2 ('cause i thought the internal airport card was bad). I'm testing this iMac with another iMac side by side, on same network position.

I'll restore the OS to 10.5 from 10.5.4 and hopefully will start working :-\

I'm at 10.4.11 since the wifi problem on 10.5.3... Still having drop offs, please see my system.log:

Aug 2 09:56:46 Hosman configd[59]: target=enable-network: disabled
Aug 2 09:56:46 Hosman /System/Library/PrivateFrameworks/Apple80211.framework/Resources/airport: Currently connected to network Moi
Aug 2 10:21:41 Hosman configd[59]: bootp sessiontransmit: bpf_write(en1) failed: Network is down (50)
Aug 2 10:21:41 Hosman configd[59]: DHCP en1: INIT-REBOOT transmit failed
Aug 2 10:21:41 Hosman launchd: Server 0 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[150]: exited abnormally: Hangup
Aug 2 10:21:41 Hosman configd[59]: posting notification com.apple.system.config.network_change

I have had wireless problems intermittently for a year, and seriously for 6 weeks. Apple denied the issue and was no help in spite of many tens of thousands of people on their own discussions complaining. I found a post suggesting a couple of things which fixed the problem. I don't know if both are necessary, but the first by itself does not solve the problem.
Lock the channel of your router to channel 1, apparently Apple and 802.11n don't play well together on higher channels. When this becomes a standard this will be resolved I hope.
Open your network preferences, select 'airport' and advanced. Delete unused networks. Select your network.
Open TCP/IP and write down all the settings, configure iPv4 manually. Enter the settings manually. Turn off IpV6.
Open DNS and write down your DNS server. Delete it and re-enter it manually.
This has worked on 2 macbooks and an iMac for the last 3 weeks with no network drops.
Joe Shea
Philadelphia

I also have this problem, on my second 24" iMac and after the updates to 10.5.4 loss of airport connectivity. Hopefully the 10.5.5 update will fix these issues? Is Apple responding to this problem at all???

I have confirmed that 10.5.5 does NOT fix this problem. I am getting the exact same errors as before after upgrading the system today. I have been using ethernet since receiving this iMac but would like to use Airport on this NEW computer. Does anyone have a fix for this?!?!?!?

10.5.5 did not help me as well. I am really irritated now. I will contact Apple Care this afternoon to press on my existing issue number and will post any updates.

Did you have any luck? No-one seems to have found a definative answer yet. I'm having the same issues. Very frustrating!

As I've stated in other threads about this, this is not a hardware or router issue. Not even an OS issue. This is an Apple software problem. More specifically related to the latest airport update "AirPort Extreme Update 2008-002". My iMac ran perfect for 10 months until I updated the Airport Extreme software (that controls the internal iMac wireless airport card) back in June. Another easy test to prove that this is software related, when you have 0 bars, click on the bars...a pop up window will allow you to toggle the airport setting. Just disable airport, and then re-enable it. Four bars again! Toggling the software off and on as a workaround is not a hardware or router issue...it's a bug in the software. I first had this problem back in June running OS 10.4.11. Upgraded the "Airport Extreme Update 2008-002" software, and BAMMM!!!! No / weak wireless signal. I then upgraded to 10.5, and still had the problem, so I upgraded to 10.5.5 and STILL have the problem. Until Apple fixes the "Airport Extreme Update" software, you will see this problem on any version of OS that has Airport Extreme Update 2008-002 on it. The only way to fix this is to revert back with time machine to before June when this "Update" was released. I, unfortuneately, did not have time machine back then (as stated earlier, I was running 10.4.11 back in June). So I must wait it out until Apple fixes this. The problem is not the Mac OS, or any hardware. It is specifically the "Airport Extreme Update 2008-002", and how it interacts with the iMac's airport card that is causing this (since other Macs are not affected by this software bug). Everyone call Applecare to let them know!!!!!

No luck at all 😟 Went through several additional steps with AppleCare and engineering but it did not change a thing. Even a full "install and delete" did not help sigh
The AppleCare guy said it looks pretty much like I have to send the iMac in 😟 Maybe it is really related to an hardware issue in my case.