I did that forward router thing. It passed.
But on on the buttom of Bittorent, it say that there's an Network error.

If you passed an online port test, there is a good chance the network error will go away when you get connected to a torrent.
My 6.x series BitTorrent will show a yellow status for a bit into a download.
My 5.x series does shows Online, ports open, pretty quick.

Which version of BitTorrent (Help>About) are you using?

6.0.3 build 8642

What color is the network status?
Do you have a healthy torrent going?

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I did that forward router thing. It passed.

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Did you use Options>Speed Guide (Ctrl+G) and Test if port is forwarded properly?

Yep, sometimes it says that there's a network problem. Some times it doesnt.

Do you know what's the best port to get better speed downloads?

A port in the 48152-65534 range is suggested, but that is only to avoid any possible conflict.

Check at Options>Preferences>Connection and make sure that the options Randomiaze port each time Bittorent starts and Enable UPnP port mapping are disabled.

I would suggest trying this torrent, KNOPPIX, before you change anything else.
It is almost always running fast and you should see good speed within a few minutes.
You don't have to download the whole file, although it is useful, just use it as a check of your down speed and connection.

Thanks.

It went faster and I found out that I forgot to port forward it to my router.