Can't host while directly connected to modem

[VerticalHorizon]

For the first few weeks or so after buying my new DSL modem I was able to host, now all my servers come up dead for some reason.
I am directly connected to the modem so I don't see why it's doing this, and what puzzles me most is why it was working at first and now it isn't.

[Ad Bot]

[VerticalHorizon]

Bump.

[Chrono]

Thats interesting. Maybe your ISP doesn't allow it? I don't see why.

[VerticalHorizon]

But it was working for about a week.

[VerticalHorizon]

Bump.