Can't detect network?

I'm using a wireless connection at the library, and as long as I connect through Firefox it works fine (Safari gets picky about it), but I have trouble with both Mail and iChat AV. Neither can detect the connection at all. I ran connection doctor, and it just told me I have no network connection. I pinged the servers through Network Utility and it worked perfectly.
Any tips or tricks to get this running? Did Bill screw up our wireless? Do Linksys WAP54G not work with Mail and iChat?
At least my browsers work, but it would be nice to use some other programs...

Go to Apple Menu > System Preferences > Network, choose Network Port Configurations from the Show popup menu, and make sure that the configuration used to connect to Internet appears at the top of the list.
Also, the Mac OS X 10.4.7 Update introduced connection issues as a result of (according to the documentation) “Mail now supports connecting to mail servers through a SOCKS proxy”. If that’s the problem, you must go to System Preferences > Network and disable the SOCKS Proxy in the network configuration used to connect to the Internet, if it’s enabled.

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