Connecting to third-party router, but unable to browse or e-mail

I am using an Airport Extreme card in my PowerBook G4 running firmware version 405.1 (3.90.34.0.p18). Our office Wi-Fi access is through a third-party router. We used to use MAC address filtering, and I had no problem accessing the network.
Recently, for reasons unclear to me, our IT director ditched the MAC address filtering in favor of the WPA-personal standard. I was able to enter the encryption key and get connected to the network, but I wasn't able to get my browser to access the internet, nor send or receive e-mail traffic.
Our IT folks temporarily disabled all security and restarted the wireless router, but I was still only able to connect to the router, and not use my browser or e-mail, so it doesn't seem to be a problem with the use of WPA per se. I tried temporarily turning off my own firewall, too, but the problem remained.
Oddly, I can open up the Terminal and Ping successfully to an outside address -- only http and e-mail traffic seems to be blocked. The Windows-based PCs seem to be able to connect to the wireless network and use their browsers to access the internet without any problem. Any thoughts as to what else I might try, or have the IT administrators try, to resolve the problem?
Thanks,
Sid

Hello kilgores. Welcome to the Apple Discussions!
Something to ask your IT staff is if they use a proxy server for Internet access. If so, do they require proxy configuration scripts (.pac) to provide access to the Internet through your company's firewall. This information would normally be added to your browser's settings.
For Safari: Preferences... > Advanced > Proxies > Change Settings... > Automatic Proxy Configuration

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