OK, there is probably some sort of weird routing problem and it might not be your problem at all.
You might be able to debug it yourself using traceroute; find out at which common point the routing stops. If a traceroute doesn't get out of your network, you know it's you. If it gets to your provider but not out, you know it's them.
Compare the traceroute from your shell account to the home account. Might be interesting.
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