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I can receive incoming UDP but not TCP


Brod

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uTorrent 3.1

Billion 7800N

Windows 7 x64

DHT enabled

uTP disabled

Windows Firewall disabled

Comodo Firewall disabled (for troubleshooting)

I have forwarded my incoming port for both TCP and UDP in my router, however the only incoming connections that I receive are UDP, and private trackers do not see me as connectable.

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That sounds very much like the problem that I now have. In the last few days, I have noticed a serious problem when trying to download anything at all on Torrent, at least using uTorrent 3.0 with Windows XP which have previously worked well for some time. It has progressively become virtually impossible to download anything that uses only HTTP trackers, including and especially http://inferno.demonoid.me[port]/announce trackers because only a few Demonoid torrents have also other (non-Demonoid) trackers or allow DHT or Peer Exchange or Local Peer Discovery. As the result, I now find that I can download practically ONLY those Torrent downloads that are not "private", i.e. those that allow DHT and/or Peer Exchange and/or Local Peer Discovery, as only they now allow connection to seeders and peers. However, I can connect to just a few UDP trackers. Almost without exception, when my computer tries to connect to a HTTP tracker, including Demonoid ones, it shows this message in the "Trackers" tab: "Proxy connect error: No connection could be made because the target machine actively refused it".

I have tried lots of connection and "advanced" setting changes, including using both direct and proxy connections, and changing port numbers, along with changing my IP address by rebooting my DSL modem, and rebooting my computer and shutting down other programs, without success. I am beginning to suspect that most HTTP trackers, including Demonoid's, are blacklisting or banning whole ranges of IP addresses corresponding to those of entire countries including mine (New Zealand) and/or known proxy-servers, because someone I know in the USA also using uTorrent 3 has not reported this problem, or else they have introduced bans based on numbers of connection attempts or volumes of data downloaded.

Can anyone please suggest what has gone wrong, and how to fix or bypass the problem? Thanks in advance.

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I have placed my computer in the router's DMZ to no effect.

I have tried everything I can think of and the only thing that comes to mind that could explain this is that my ISP is blocking incoming TCP connections, either for all ports/applications or for P2P specifically.

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