Strange port forwarding problem

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Joined
5 Oct 2006
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892
Location
Cardiff
I originally thought it was a problem with my router, so I took it out of the equation and just plugged the virgin media modem directly in to the pc through ethernet, still in port tests it claims it is closed.

I thought, maybe it's since i've installed Win7, as everything was fine in Vista, so I loaded up my Ubuntu live CD to rule out any software problems, and still... the ports are closed.

Strange thing is, if I connect the router up and enable Upnp, and then use an application which is enabled for Upnp, the port will show as open in port tests. When I disable Upnp on the router or don't use an application which has Upnp enabled the ports are closed.

Tests carried out with upnp enabled application (utorrent)

Example 1: Upnp enabled on router, open utorrent with upnp enabled in settings: Port is successful in the port test.

Example 2: Upnp enabled on router, open utorrent with upnp disabled in settings: Port Unsuccessful.

Example 3: Modem only, no router, no software firewall enabled. Open utorrent, port unsuccessful.

Very strange.... I actually gain out of having the router connected rather than removing it. I really don't understand this one.
 
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