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You have to update the Windows Registry to change these values. Here's a Windows 2000 doc on the registry settings – http://technet.microsoft.com/en-us/library/bb726981.aspx

• MaxUserPorts controls the upper range for user ports.
• TcpTimedWaitDelay controls the TIME_WAIT delay.

Increasing MaxUserPorts (e.g. 65534) and decreasing TcpTimedWaitDelay (e.g. 30) may fix the problem.