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Windows server 2008 fails to respond to SYN sometimes

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http://serverfault.com – I have a problem seen on Windows Server 2008 running IIS 7. I have seen a packet trace where the server stops responding to SYN from clients. However, it will respond to intermediate SYNs i.e Say Client A sends SYN 1 at time t1. Server will not respond Client A now sends SYN 2 for a *different* connection at time t2 (t2 > t1) Server responds. Client A retransmits SYN 1 . Server fails to respond Ultimately client A times out. How do I find the reason why server is not responding to one particular connection. Are there TCP stats that one can see on the Windows Server? (HowTos)