My internet pc has two network cards. One for my DSL and one for my local network. My other pc is connected to a switch for the local lan connection. The internet pc has three connections, local lan, dsl and PPPoES (something like that). This is the connection I am sharing with my local lan. My problem is, my other pc can only access certin websites. Also, I cannot Update my Quicken accounting software with my bank.

How can I fix this? Is there a better method I can use to share my internet connection?