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Have you tried pinging the IP address of the Airport when it is not working? Might be a change in the WPA2 settings when attempting to connect. In that case, reset by: Settings&gt;General&gt;Reset&gt;Res<wbr />et Network Settings.
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Have you tried pinging the IP address of the Airport when it is not working? Might be a change in the WPA2 settings when attempting to connect. In that case, reset by: Settings>General>Reset>Reset Network Settings.

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I am attempting to wirelessly extend/repeat a Wi-Fi network that originates in a 4th generation Time Capsule with a 1st generation N version Airport Express. <br />
<br />
I am going through the settings, i choose to extend an existing network, pick the network in the drop-box enter the proper password.<br />
after applying the changes, it breaks the existing network and all connections are lost. <br />
if you unplug the airport express then the network works again. <br />
<br />
Any ideas? this makes no sense.<br />
<br />
Both units are running the most recent firmware, i have factory reset both and set up from scratch again but the issue persists.
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I am attempting to wirelessly extend/repeat a Wi-Fi network that originates in a 4th generation Time Capsule with a 1st generation N version Airport Express. 

I am going through the settings, i choose to extend an existing network, pick the network in the drop-box enter the proper password.
after applying the changes, it breaks the existing network and all connections are lost. 
if you unplug the airport express then the network works again. 

Any ideas? this makes no sense.

Both units are running the most recent firmware, i have factory reset both and set up from scratch again but the issue persists.

Extend Wi-Fi w/ Airport Express breaks existing network

Apple devices including Macs, iPhones, iPods and iPad support standard wired and wireless networking technologies, but they also utilize custom applications and some special techniques for networking with each other and with non-Apple devices. Apple manufacturers the AirPort line of wireless networking products, and has its own networking protocols, AppleTalk and AFP (Apple Filing Protocol).

Apple Networking

All of Apple's hardware is produced solely by Apple Inc., who determines internal systems, designs, and prices. Apple buys certain components wholesale from third-party manufacturers. The current Mac product family uses Intel x86-64 processors. All Mac models ship with at least 1 GB RAM as standard. Current Mac computers use ATI Radeon or nVidia GeForce graphics cards and include a dual-function DVD and CD burner, called the SuperDrive. Current Apple hardware includes the iPad, iPhone, iMac, Mac Pro, Macbook, iPod and Apple TV. Discontinued hardware includes the Apple I, Apple II, and the Apple III, the Lisa, the Newton, the Quadra, Performa, Centris, Macintosh II and LC series, the Power Macintosh, iBooks and the MacBook.