[Scott L.]

Are you connecting the modem the same at both locations? IE is there a router the modem is connected to at both test locations?

If there was a router atached at your house and it works, the modem would be in bridge mode (the login credentials are entered in the router), and if there is no router at the pantry than the modem needs to be set in normal mode(login credentials are entered in the modem).

Try connecting the modem at the pantry directly to the Demarcation piont, bypassign every phone line, etc in the building, if it connects than, that would indicate that the fault exist in the building, if not than the problem is upstream of the demarcation piont, and probally a problem with the providers network.