How do i set up xbox live with internet connection sharing through my laptop?

I have xbox 360 and xbox live. I set up iternet connection sharing through my laptop to play xbox live and it worked for about a week, that is, until i went to columbus and brought my xobx 360 and laptop with me. To use the internet at my hotel i had to change alot of settings on my laptop, similar to setting up a vpn. When i returned to my home, i hooked up xbox 360 to my laptop how i had had it before, my xbox live wouldn’t work. Does anyone know how to fix this? Step-by-step answers wpuld help. And i use wireless internet on my laptop and cannot hook my 360 directly to the modem because it is about 150 feet away.

Related posts:

1. Can internet and xbox live ethernet cables be interchanged often without connectivity problems?
2. How can i connect to Xbox live when my computer and xbox are in different rooms?
3. Xbox LIVE Extras and Games Preview – Plus Windows Phone 7 Integration
4. Microsoft’s Xbox Live Consolation Prize for Depressed Halo 2 Fanboys [Xbox Live]
5. Xbox Live Silver to be called ‘Xbox Live Free Membership’