UGH! I am getting soooooo sick of this half-open limit in the TCPip.sys file in XP and Vista. I just reloaded my system, and applied the cracktcpip patch, but I'm still getting Event ID 4226 errors. So I thought I'd try one of the patched versions of the file. After reading the instructions, I think I get why this is happening. From what I'm reading, the tcpip.sys file on a Vista SP1 system should be version 6.x, but mine is still version 5.1.2600.5625. I don't know if SP1 failed to upload it or what. But the bottom line is that now I can't seem to get around the stupid half open limit. Suggestions?