Half-Open Patcher Speeds Up BitTorrent Downloads

Half-Open Patcher Speeds Up BitTorrent Downloads

Windows only: Did you realise Windows only allows 10 outbound connection attempts at a time? A simple patching utility can fix the problem and speed up your BitTorrent downloads.

Microsoft first introduced these limits into Windows as a way to stop the spread of viruses and worms—because they try and connect to thousands of addresses at a time looking for security holes. What ended up happening instead is a restriction on your BitTorrent downloads, especially from busy torrents where your machine may need to connect to plenty of other systems at once.

This utility does its magic by patching a critical system file, so readers should proceed with plenty of caution—but it might be worth a look as a way to speed up your BitTorrent downloads.

Half-open limit fix is a free download, Windows only. If the whole BitTorrent scene has you confused, check out our top 10 BitTorrent tips and tricks.

Half-open limit fix (patch) for Windows [via Download Squad]


  • Thanks ! Downloads hit top speed instantly, insofar as I can tell top speed also appears to be up by roughly 30%, no other side affects apparent at this time.

  • The reason MS issued the fix is to slow SYN floods down so much that they become unworkable. The attackers are not looking for security holes, but for legitimate access points like web servers. They’re trying to tie up all of the SUA’s available sockets. It’s not an attempt to infect, it’s a denial of service attack.

    The limitation, and the patch, determine how quickly you can start new connections to others in the swarm, which would be connections initiated by your client — local initiations.

    The best, fastest connections, the ones we all try for, and fuss with routers, port-forwarding and firewalls in order to get, are remote initiations. None of this can affect remote initiations at all.

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