Could you tell us what OS is running the IIS service?
Are you hosting from a mac or a pc?
how are you trying to open the pages you wish to access?
What address or ip format are you using to address the pages, such as http://192.168.0.88 ?
Let us know a little more detail.
How are the machines connected?
Is your mac hardwired or wireless?
What happens if you try to address the server via localhost http://127.0.0.1 ?
Let me know