My son who is in shared accommodation recently started using broadband. He has found that although his computer is not on his broadband usage is being consumed. It seems to me that someone is tapping into this. What can he do to stop this?
Are there any other telephone points in the house connected to the same line? It is not impossible that, although the line is his, it was connected using existing wiring which would allow access to others. They would then simply need to gain access to his logon identity and password.
I would suggest that as it is wired broadband, he check for other phone points, check with his ISP the account cannot be used by wireless (I feel certain it can be) and get his password changed. He should then ensure that only he knows it and allows no-one access to his PC as the password will be accessible to anyone who has such access.
If it's been installed to his room only, and not wireless, no way could it be hijacked. BUT, even though he is not connected wirelessly, doesn't mean the router isn't capable of it. If this is the case he needs to set up security on the router. Way to do it varies from make to make. If you could post the exact model of the router, we can determine if it is wireless and how to secure it.
There are no other phone points; he had to have the line put in; Although he is connected through wired his router will do either. Not sure what router but it has just been installed by BT two months ago