tcp optimizer for Vista users. removes the in-built concurrent half-open TCP limitations, especially for BTing:
Windows Vista tcpip.sys Connection Limit Patch for Event ID 4226 » My Digital Life
works fine for me with utorrent 1.6 under vista ultimate.
i’m able to max out my connection speed (60kb/sec), same as when i was using XP. enjoy 
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^^ you’re most welcome. enjoy BTing in vista now 
(Posting in an old thread coz this is all I could find on TE)
I’m using Vista Ultimate x64, getting the 4226 event so searched and found a couple of links (other than the above):
64-bit (x64) Windows Vista SP1 (6001.1800) tcpip.sys Auto Patcher to Fix Event ID 4226 and Unlock Increase Maximum Connections Allowed Tip and Trick
Windows Half-open limit fix (patch) - Home
I know Vista has some driver signing etc and looking at the half-open download there is a “test certificate” with all sorts of permissions which looks like danger to me…
Anyone tried these out and/or know if there are any problems or should I go ahead and install? AVG antivirus doesnt give any warnings…