After a proper SYN, SYN+ACK and ACK TCP-Handshake, the server immediately sends a FIN+ACK indicating a graceful connection closure. The client's HTTP requests results in RST packets from server. This happens once in a 100 concurrent calls. I have already investigated into SynAttackProtect parameter and Backlog Queue and these were related to connection resets, so unrelated to my problem. So in what cases will a Windows server suddenly issue a FIN, immediately after a successful TCP handshake?
migrated from stackoverflow.com Jan 14 '13 at 18:37
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Http.sys intermittently ends TCP/IP connections in Windows 7 or in Windows Server 2008 R2
Http.sys has been superseded since that hotfix was released. If you want a more current version: