Airport Extreme causing "Connection Failed" to connected disk

I have a relatively new Airport Extreme, with a MyBook 500GB external hard drive connected to it. There are 2 Macs (a MBP and Mac Mini) that backup to that hard drive wirelessly with Time Machine. Both Macs have no problem connecting to the disk drive for a couple of days or so, and then all of a sudden, Time Machine reports an error, and when trying to open the drive in Finder, I get the error message "Connection Failed". Every time this happens, I can fix it by unplugging the drive from the Airport Extreme, and plugging it back in. That will usually make it work for a couple of days, but sometimes less time than that.
I can't see it being a formatting issue with the disk, or any kind of connection issue, since it does work for a period of time. But why is does it suddenly stop working for both Macs?

Welcome to the discussions!
Your drive is formatted correctly if you have been able to make Time Machine backups.
Part of the problem may be that Apple does not officially support Time Machine backups to a drive at the USB port of the AirPort Extreme. That doesn't mean it won't work...it's just that Apple will not provide any help when difficulties arise with this configuration.
Some users report that this works well for them and others report intermittent to constant problems.
You might try using Disk Utility to check and repair permissions on your computers that are backing up to the Time Capsule.
Hard Drive > Applications > Utilities > Disk Utility
Click the disk on the left that exactly matches the name of the hard drive on your desktop. If you have not renamed it, it will be Macintosh HD.
Click Repair Permissions. This will take 30-60 minutes on average.

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I have added very few apps to my G5. The majority of my time is spent editing photos with PhotoshopCS3. I have software updates set to run weekly and have always kept them up to date. I really believe it's a disk permissions issue...but repairing them doesn't help.
*+Upon installation, I used Archive and Install.+* While I agree that Erase and Install may sound like a good idea, it makes me nervous. I do have everything backed up on a bootable CMS drive, but I'm a photographer and was hoping to not have to erase the G5.
Yes, as I mentioned in the original post, I've downloaded and installed the Airport firmware update. And all software is up to date.
All was working just dandy before the upgrade. Unfortunately now it's sounding like I may have to erase my hard drive and install fresh.
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You have an Airport Extreme base station that is set to "Create a wireless network" and you have the box checked for "allow this network to be extended"....
Then you have an Airport Express that is set to "Extend a wireless network" which you selected the name of your network in the box...
Correct?
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http://support.apple.com/kb/HT4259?viewlocale=en_US&locale=en_US
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Here is one for our local ISP.
http://www.avenard.org/iptv/Setup.html
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Since I could not find an answer on the support site. I contacted Apple Support. Once I explained the symptoms the tech seemed to know exactly how to address my issue. I will explain what happened in hopes that it will assist you. It seems that the issue has to do with the type of wireless network security set up in the Airport Extreme that conflicted with the Vista notebook's wireless adapter.
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Message was edited by: Bob Timmons

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Airport Extreme causing "Connection Failed" to connected disk

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