My buddy was having a few issues that might relate. Since everyone and their mother are using routers now they can be the source of a lot of your headaches if you aren't familiar with configuring them.
Try taking the router out of the equation for you cable users. Or with certain routers go in and change the firewall field to gateway. Just for the sake of testing.
For DSL users, it's a tad different depending on your ISP. I know ameritech actually gave us a good router/modem, whatever you want to call it. The problem is no interface to support it, so unless you are familiar with all the command lines telnetting in you're SOL. :|.
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Odine Shadow
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