Issues with creating a wifi hotspot with Macbook Pro

Hello. I am staying in a hotel with others for an extended period of time. There is only one ethernet port. I have previously used the ethernet via internet sharing to turn my macbook pro into a wifi hotspot. I went through the steps this time (checked, double-checked, and triple-checked via various websites), and though my computer says that it is broadcasting, AND all the other devices (iPhones, other laptops) can see and connect to the network, no internet seems to be coming through the broadcasted connection.
What I mean is, the network exists, and when others connect it shows full signal in their airports, etc, but they still can't connect to the internet. Pages won't load, my iphone tells me that it's "not connected to the internet" even though it has full wifi bars. Is there some important step that I'm missing? I am running Snow Leopard.
When I did this before, I feel like there was some other strange option I either had to enable or disable, but that was a long time ago and I can't recall. Right now, I just go into internet sharing, set "ethernet" as broadcasted from, and "airport" as broadcasted to, then I name the network and click "Start" and everything seems to work, except for the not actually being connected. Can anybody explain this?

I can indeed get on with just my Mac, as can my roommate (he also has a Macbook Pro). I have not tried turning off my firewall. That may do it. However, I do not know how to turn off my firewall. I could just google it, but I figure I'll ask y'all anyway.

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