VPN - Unable to load Citrix page via Airport (but works w/other router)

I had successfully used my PowerBook to connect to my company's system via VPN and Citrix for 3 years using an Airport Extreme connected to a DSL modem. In the last 6-8 weeks or so I have been able to establish a VPN connection, but my browser is never able to load the Citrix Metaframe page, so I can never connect and do work.
Internet Explorer had worked previously, but now gives an immediate "access failed" message. Firefox hangs indefinitely as it tries to load data. Maybe this is due to a security or other software update. I have not made any hardware changes (other than unplugging and restarting everything). NOTE: I AM able to login using other wireless routers, so I suspect the Airport Extreme is at least part of the problem. Any idea how I might fix this? Thanks!
PowerBook G4 Mac OS X (10.4.8) 17" 1.33 GHz + Airport Extreme

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VPN - Unable to load Citrix page via Airport (but works w/other router)

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