AirPort won't reconnect after wake in OS 10.6.7

My iMac will no longer reconnect to my WiFi network after restart or wake from sleep. I have to manually add my network (configured with hidden SSID so I have to type in the name and password) and then the connection is fine, until next sleep. This only affects one of the two iMacs on our home network, and only started recently. I searched these discussions and only found old threads for OS 10.4 which don't apply as the Network Preferences dialog has changed. I tried restarting the AirPort base station, turning AirPort on and off, and uninstalling Norton firewall I(which I thought might have been the culprit), all to no avail. I use OS 10.6.7, and an AirPort Extreme. The network uses WPA2 Personal security.
How can I get AirPort to reconnect after wake again? Any tips appreciated. Thanks.

It might help to reset the connection settings on your Mac using these steps one at a time until the problem is resolved, recognizing that, depending on your problem, not all of these steps will make sense:
1) Use the AirPort menu bar item to turn AirPort off, then on again.
2) Try to select your Wi-Fi network from the AirPort menu.
3) In the Network panel of System Preferences delete the AirPort item from the left column, then add it back.
4) In the same panel as (3), define a new location and see if you can make that work.
5) In the same panel, select the AirPort connection item, click the "Advanced" button, select the "TCP/IP" tab, then click "Renew DHCP Lease". Note that the fix this step implements may be temporary.
6) In the folder /Library/Preferences ( _not_ <yourhomefolder>/Library/Preferences), move the folder SystemConfiguration onto the Desktop, then restart your computer. See if you can now make your AirPort connection work.
These steps may not help, but they'll only take a couple of minutes to try. Before you try these, if you have any special network settings on your Mac for things like DSL credentials, note all your network settings, because the latter steps will destroy them. If you got all the way to the last step, if things don't work any worse than before, you can trash the saved SystemConfiguration folder.

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Hey everybody,
I've been using my PowerBook G4 for quite a while without any problems. Recently, and I'm not sure exactly what I did before it started happening, every time I close my powerbook and it goes to sleep, the AirPort card no longer works when I open it back up, it just shows grey bars for no signal. I've tried setting up the connection again by entering an SSID when it does this and it just tells me with a generic error that it can't join the network.
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Since no-one else has chimed in...
Back at the end of April Apple released a Security Update (2007-004). They quickly replaced this with 2007-004 v1.1 due to an issue with Airport not reconnecting after sleep, however the issue was supposed to only affect 10.3.9 machines.
Security Update 2007-004v1.1.
regards
mrtotes

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Test after taking each of the following steps that you haven't already tried. Back up all data before making any changes.
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If after installing Security Update 2007-004 on OS10.3.9 and after waking from Sleep you experience a kernel panic notification (black pane) to reboot with the power button ......... do the following:
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DIXIE
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Airport won't work after sleep

I have a powerbook G4. I have used it flawlessly for years between two locations, closing it up to sleep and opening up at the new location. It would find the airport base stations and connect perfectly. Now when I open it up, airport does not automatically connect and in fact does not show my airport network or any of my neighbors' wifi hot spots. I use the airport utility and it finds nothing. Turning my airport on and off won't work either. In order for airport to work, I must reboot each time.
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If after installing Security Update 2007-004 on OS10.3.9 and after waking from Sleep you experience a kernel panic notification (black pane) to reboot with the power button ......... do the following:
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Magic Mouse won't reconnect after Lion upgrade

Okay, I'll lay this out as quickly and consisely as possible.
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Hi, I had the same problem but it's fixed now. It seems that the order you turn mouse and bluetooth off and on makes the difference. This is what worked on my macbook pro (eventually!):
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Is the battery charging or charged. If the battery is charged do a cleanup>reboot from the recovery screen.http://forums.creative.com/creativel...ap&thread.id=3

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whetsel.m wrote:
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Hi all,
I have a problem with Airport not automatically reconnecting after the computer wakes from sleep or is turned on or rebooted. I have it set to join a specific network automatically. Any idea why this may be? It used to work just fine.

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AirPort won't reconnect after wake in OS 10.6.7

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