Client cannot open socket

's Computer Specifications

We run our proprietary server application on Window 2000 Pro server. Clients open TCP connection to get real time market price updates from the server. Some times client fails to open a socket. We have retry procedure and in most cases after 10-30 attempts client succeeds to open the socket.
Why it happened?
We have 100-200 concurrent users.
netstat shows several (5-6) SYN_RECEIVED and CLOSE_WAIT statuses.

's Computer Specifications

Do you do have Server or Pro?

's Computer Specifications

Server (standard not advanced)

's Computer Specifications

These articles could help:

HOW TO: Harden the TCP/IP Stack Against Denial of Service Attacks in Windows
2000
http://support.microsoft.com/default...b;EN-US;315669

How to Troubleshoot TCP Ports That Stay in the SYN_RECEIVED State for Long
Periods of Time
http://support.microsoft.com/default.aspx?scid=kb;[LN];296692

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