Ethernet never works when plugged in

Ever since I got my ibook in 1/06 my ethernet has never worked when plugging in with a cable. I have tried several different cables/boxes/etc and it shows that it is connected with an IP address (when checking network status), but I cannot get on the internet. It has never been a problem before because I just use wireless instead, but now at my job my only option is plugging in. Any suggestions?

Welcome to the Apple Discussions!
...but now at my job my only option is plugging in.
Does your work have a proxy server in place? If so, you may need to adjust your Network System Preferences to reflect this setting. You'll have to ask as network administrator there if this is the case and to find out what the name of the proxy server is. The Network System Preferences may very well say you have an IP address, but without the proxy settings you won't get outside of your network to the Internet.
-Doug

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