AirPort Utility 5.4.1 reading AEBSn config error -6728

While in the process of updating the firmware (7.3.2 to 7.4.1) of one of my Airport Extreme N base stations (gig edition), I keep running into the following pop-up error message when I try to access the base station via Manual Setup. After about 37 seconds "Reading the AirPort Extreme configuration...":
"An error occurred while reading the configuration. Make sure your Apple wireless device is plugged in and in range of your computer or connected via Ethernet and try again. (-6728)"
Alternatively, when I try to update the firmware via the Update Firmware button, after it asks for the base station password, it says "Searching for latest firmware version..." and the progress bar spirals forever ( > 10 minutes). I must quit AirPort Utility to stop this endless "searching."
I have updated several other AirPort Extreme and Express N base stations in my network without running into the problems above (no problems accessing base station configs, and firmware downloaded and installed immediately), so it appears this particular base station is not fully cooperating with AirPort Utility. However this base station is still functioning within my wireless network, providing access in Finder to an attached USB drive and serving as the main base among several other Extremes in an Extended network.
I have tried through AirPort Utiliy:
Base Station -> Identify... THIS WORKS
Base Station -> Restart... THIS WORKS
Base Station -> Upload Firmware... -6728 error
I have also unplugged the unit to force it to cold boot. No success getting into configuration.
The MacBook Pro from which I am running AirPort Utility 541.9 is connected directly via ethernet to a LAN port of this AirPort Extreme (the laptop's internal wifi disabled to prevent multi IP conflicts). The AirPort Extreme WAN port is connected via ethernet directly to my router. There is confirmed Internet connectivity, and per my router each device has its own unique IP address.
So:
1. What does "error (-6728)" mean specifically?
2. How do I regain access to this base station, so that I can get into its configuration and do a firmware update?

Thanks Sascha H-K. Your suggestion worked!
I removed AU 5.4.1.
I downloaded and installed AU 5.3.2.
THEN, running AU 5.3.2, I was able to enter the manual setup configuration of my stalwart AirPort Extreme base that would not respond to AU 5.4.1.
From there I was able to update the base station firmware to 7.4.1.
I noticed that when running AU 5.3.2, all the updated 7.4.1 base stations do not appear in Wireless Clients in Base Station -> Logs and Statistics. (Running AU 5.4.1 solves that problem.)
Now, I am back to running AirPort Utility 5.4.1, and I am able to access manual setup configurations for all my base stations.
It's weird this method worked. But I'm glad I didn't have to force a hard reset on the base station and lose all my network settings, bringing down the whole network since it was the main base station that didn't respond.

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SOLUTION TO TRY
As I mentioned I did a network packet sniff and found IPv6 traffic going between Mac and AEBS. I had one machine (MacPro) which had 5.2.1 update installed and one (MacBook) which didn't. The MacBook 'handshaked' sucessfully via IPv6 with AEBS, the MacPro did not.
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To try yourself to see if it solves problem:
1) Using account with administrator privileges open System Preferences, or use user account to open and authenticate after with administrator account.
2) Open System Preferences | Network
3) Choose either wired (Built-in Ethernet) or wireless (Airport) network connection and click "Configure"
4) Choose TCP/IP tab then click button "Configure IPv6..."
5) Set drop down list "Configure IPv6:" to "Off"
6) Click "Apply Now"
7) Retry to connect and load AEBS config - should work.
IPv6 is not needed for most machines, it is not required for Internet access.
Please note this is a workaround, I believe a bug was introduced in the 5.2.1 AirPort Utility update.
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Hi Philjp,
If you are having issues connecting to your Airport Time Capsule, even after a factory reset, you may find the following article helpful:
Apple Support: AirPort base station not seen or "An unexpected error occurred" appears in AirPort Utility 6.3
http://support.apple.com/kb/TS4597
Regards,
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I am running Mac OS X Lion 10.7.4 (11E53) and cannot get the Airport Utility to run at all. [5.5.3] The application icon flickers as though it is about to launch and then nothing happens.
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Welcome to Apple Communities
Backup your files and try this:
1. Reboot from recovery partition (or as in my case USB recovery drive)
2. Select Re-install Mac OS X
3. Allow the process to run through multiple restarts
4. When reinstall process is complete run software update (side note, my software update would not launch as long as my USB recovery stick was plugged in, weird)
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it worked fine in the past. then I tried to switch to time capsule. I had problem with this. Probably I deleted in the airport utility programme my old airport express (pressing ignore).
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Jeff

Ok - had to wait until I was back at the location that has this Time Capsule to try your suggestion. I unplugged the TC for over an hour, then plugged everything back in, and waited for it to show up in AirPort Utility again (TC showing a slow flashing yellow indicator - remember, I have already tried to do a factory reset, or hard reset before my original post). I depressed the reset button and held it for more than 30 seconds, with no change to the flashing indicator, and nothing changed when I released it either. I again tried a hard reset by unplugging the TC, (wait a bit), and depressing/holding the reset button, and plugging it back in again. Soon after that, I get the quick flashing yellow indicator. Since I didn't get very far with this last week, I continued to hold reset button, and after about 30 seconds it stopped flashing altogether, and stayed off. I then released the reset button, and the TC restarted, and showed up in AirPort Utility again, but still am unable to go into configure it - it just times out trying to connect, and give the same message:
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I'm going to take the TC with me this time, and take it to an Apple store, I just know that they are going to say it's dead, and would like to know that I have tried everything else before hand.
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Take care!
Jeff

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Hi,
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rshammaa wrote:
When I open Airport Utility it scans looking for devices and finds none.
Try connecting your Mac to the AirPort Express with an Ethernet cable to see if that allows AirPort Utility to see it.

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The Factory Reset Gen1-4.
Unplug your TC. Hold in reset. and power the TC back on.. without releasing reset for about 10sec. When the status light flashes rapidly; release it.
Be Gentle! Feel the switch click on. It has a positive feel.. add no more pressure after that.
TC will reboot after a couple of minutes with default factory settings and will wipe out previous configurations.
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vasteven wrote:
I plugged the modem ethernet into the LAN outlet in the back of the TC
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Message was edited by: kidhack
Message was edited by: kidhack

Check the firmware of the airport, versus the software of the airport utility on the computers in question, the 2 should match reasonably; the latest of the 2 are airport utility 5.4.1, and firmware 7.4.1. So for instance if you have airport utility 5.4.1 and airport firmware 7.4 the 2 will not read correctly and may hang in random spots, or give you other weird problems. Assuming this does not fix it connect the airport directly to the computer through one of the LAN ports and configure it that way

AirPort Utility 5.4.1 reading AEBSn config error -6728

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