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I'm not sure I can help specifically, but no doubt someone on here can.
A couple of issues of clarification:
Are you connecting direct between a PC and the modem, no router? If a router is present, get rid of it for now so that a connection can be proven direct between modem and PC.
Are you using ethernet not USB
Are your network connections and internet explorer settings all set to the "automatically detect" options?
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BTW the IP address you give for authentication works from here