IMac fails to connect to AT&T U-verse via ethernet

I'm not a noob when it comes to my mac, but I don't know much about networking. This problem has me really stumped:
For months, my iMac was connected to my U-verse router via ethernet, by way of my time capsule as a router. Connecting to the internet via time capsule airport works fine. No problems there.
Now, starting about a month ago, my iMac won't connect to the network. When I run network diagnostics, "Ethernet" is green "Network Settings" is Yellow "ISP" is green everything else is red.
In my Network control panel, under ethernet, my status is connected. It says:
"Ethernet has a self-assigned IP address and will not be able to connect to the Internet."
Configure IPv4 is set to "Using DHCP."
Things I've tried are:
-Restarting my computer and both routers.
-Creating a new network location under prefs and starting from scratch.
-Setting my time capsule to "bridge mode."
My setup again is:
2011 iMac
Mac OSX 10.6.8
ethernet to a time capsule
timecapsule ethernet to U-verse router
ethernet connection is down
airport works fine
Thanks for any help you can provide!

Changing the default timeout cannot be done in the Advanced Network settings of Firefox, however if there are some about:config entries that you can check. The features are made available by this add on: [https://addons.mozilla.org/en-US/firefox/addon/tweak-network/] it will allow to change the max connections and prefetching and pipelining.
Otherwise, if you make changes to the advanced settings of how Firefox connects to the internet, restart it for the changes to take affect.
* [[Advanced settings for accessibility, browsing, system defaults, network, updates, and encryption]]

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Welcome to Apple. (The plainly wrong above is a figment of Apple imagination.. of strict network protocols.. but unhelpful for a home device. maybe also to encourage sales of expresses.)

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