Port forwarded but not opened ?!

[Otiel]

Hello,

I have a slow download speed and an inexistant upload speed. In the process of fixing that problem, I figured that the µTorrent Setup Guide (Ctrl+G) is telling me that my port is not opened.

The problem is I made the configuration on my router to forward the port on both TCP and UDP protocols, so it should be opened.

I'm afraid the problem is not coming from µTorrent, but I'm confused because my config used to work fine, so I'm posting here. :|

Background info :

Using µTorrent 2.2

I've tested µTorrent with another connection, and it's working fine. Seems to be only a problem of port not forwarded.

I've read the FAQ and the setup guide.

[Switeck]

Does your modem also contain router-like functionality?

[Otiel]

Yes.

In fact, I figured that the port problem depends on the time of the day. :/

This night (0030 to 0930), I was downloading and uploading to my line capacity, I did the µTorrent test (Ctrl+G) and it told me that my port was well opened. O,o

This morning, my d/l and u/l speeds were at 0 kb/s,and the port test failed again.

Could that be a problem coming from my ISP ? If they were throttling traffic at day, does the port test would fail this way ?

[Switeck]

If the ISP is throttling, they can do a LOT worse than just block ports.

[Otiel]

Well, I know but my real question was more : if my ISP were blocking bittorrent ( _ first is it common for ISPs to block bittorrent only at days? _ ), would that result as the fail of the port test ?

[Switeck]

ISPs blocking BitTorrent only during days/peak evening hours is not unheard-of.

If block = kill incoming BitTorrent packets inbound for uTorrent's listening port...yes, that would cause a failure of the port test if the port test uses something that resembles BitTorrent packets. Or the block could be a "blanket" block and once BitTorrent packets are detected then ALL packets are blocked to that port because they're probably BitTorrent packets. This is easier for some ISPs, who then don't have to keep checking every packet once they're convinced you have BitTorrent traffic.

[Otiel]

Allright. Thank you for your answers