Speed up Bitcomet and uTorrent

Written by Ernesto on December 20, 2005 

In a previous post we advised to raise the maximum amount of half-open tcp connections to speed up your torrents. On itself this is a great trick, however I recently discovered that 90% off all people use the default settings on their client, and that’s a problem.

Both Bitcomet and uTorrent (and probably other clients) limit half-open tcp connections by default. This means even if you hack the max half-open tcp connections in windows xp, your speed will still be limited. So this is what you need to do:

First of all, read this post that gives you some tips and tricks how to speed up your torrents

1. Hack the max half-open TCP connections

Update: this tweak is NOT recommended if you use uTorrent >1.7, it may lead to unstable behavior.

If you’re on XP sp2, your TCP connections are limited to a maximum of 10. This seriously hurts your downloading speed because it wont let you connect to a high amount of ip numbers. It is supposed to slow down viruses because their spreading strategy is to connect to a high amount of ip numbers, but it also cripples your torrent downloads.
A nice way to fix this is to download this patch, it allows you to set the maximum allowed connections to any number you want. Any number between 50 and 100 is ok (more is NOT always better).

2. Configure your torrent client to allow 50-100 max half-open TCP connections

uTorrent: Options > Preferences > Advanced options > net.max_halfopen

tcputorrent

Bitcomet: Options > Preferences > Connection > max half-open TCP

tcpbitcomet

Now you’re ready to go…

relakks privacy vpn anonymous internet

A third point of interest is that some “windows updates” revert your tweaked tcp connections back to 10. So it’s wise to check this every now and then. You can check this by going to (in windows xp) Start > Control Panel > Administrative Tools > Event Viewer > System… Look for event 4226 (sort by event).

event

If there are a lot of daily occurrences it’s likely that the max amount of half-open tcp connections was set back to 10. Or you’re infected with some nasty spyware…

If you’re done, you might want to try the torrent settings optimizer to check if all setting are correct

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416 Responses

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1 Dec 22, 2005 at 07:39 by r00ted

increasing the half-open connections won’t necessarily speed up your torrents…..remember, in the world of bittorrent, more Connections does NOT equal faster speeds. If a peer has something you need, they will connect to you, and such.

And of course, use protection…lol

2 Jan 04, 2006 at 04:09 by pasteler0

after installing the patch, i’m having problems using msn and other internet stuff when bitcomet is on. How do I turn this off?

3 Jan 04, 2006 at 08:02 by Ernesto

Just run it again and change back to 10.

4 Jan 09, 2006 at 02:32 by Jay

hey i changed the max TCP connections to 80 and its made a massive differance thanks!

5 Jan 10, 2006 at 04:45 by Jae

Whoa, I did this and it quadrupled my download speeds. Thanks alot.

6 Jan 10, 2006 at 05:05 by Smart

this message is for ROOT..
you stupid fucking moron numnet..
dumshit don’t talk when u don’t understand shit…..
if you don’t connect to other user then how you know what they got..you dumpshit

7 Jan 13, 2006 at 14:00 by Max

[insert a lot of trashtalk here]

8 Jan 16, 2006 at 20:00 by the dude

gees ppl. whats with all the threats and bs language? does your mother know you talk like that? i guess that you guys are such smartasses that you do talk the same way.. PPL .. this whole thread got redundant when all this cursing.. its a commentfield for an applet tweak.. GET A FUCKING LIFE KIDS!!! grow up already and stop pestering the ppl that actually use the web for working. and not just to wank off.. im out.. great tip btw. havent been able to figure out what happend with my torrentz after sp2.. thanx peeps for pointing out the obvious

9 Jan 16, 2006 at 23:55 by Jimmy

When I try to install the patch, this is what it says… http://img.photobucket.com/albums/v194/ShaolinMilk/problem.jpg Someone mind helping me? Thank You.

10 Jan 17, 2006 at 07:42 by Miro

Jimmy: You need admin rights to install the patch.

11 Jan 17, 2006 at 23:23 by Jimmy

Um yes. I am the admin of the computer.

12 Jan 18, 2006 at 13:21 by mohamed

thanks alt

i’ll try that now

13 Jan 20, 2006 at 07:19 by FruitJuiceyRed

wow you can actually see the down speed triple-quadruple as these two steps are done!

14 Jan 20, 2006 at 08:17 by Jimmy

Whenever i try to do this, this error pops up. Can someone help me, please?

http://img.photobucket.com/albums/v194/ShaolinMilk/problem.jpg

15 Jan 20, 2006 at 17:40 by Zip

I tried the patch and increased the uTorrent to 80. So far, no difference.

16 Jan 21, 2006 at 15:03 by Lee

Thanks so much, this patch and guide made a huge difference. Really appreciate it. Lee

17 Jan 22, 2006 at 21:13 by Reg

Before I took these steps I could only get around 30kbs download tops. Afterwards I have gotten a max of 305kbs. It all depends on the nuber of seeds and peers so i choose my torents wisely.

18 Jan 23, 2006 at 01:03 by Sebastyan

I have a connection 60 Kb and i download with 7kb(torent) I have make all tutorials :((

19 Jan 23, 2006 at 05:01 by mike

how is this done in azureus?

20 Jan 26, 2006 at 12:19 by TopDog

Doesn’t seem to be doing much for me as is.

21 Jan 27, 2006 at 12:57 by foff

Mine’s automatically 500 is that good or bad?

22 Jan 29, 2006 at 23:49 by chantel

Hey, i tried to download this, and all of a sudden, my anti-virus comes up and says that i should scan my computer, and that there is a bug. someone help me please

23 Jan 30, 2006 at 07:10 by hyper

foff 500kb/s is demm good.
I tried the steps but there is no
difference…..i changed it to 80 by the patch and then when i went to bitcomet the max half-open TCP connection was still at 10…….so i increased it to 80 but no difference.
Can someone plz help…thanx

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