Windows TCP/IP settings

To decrease the interval between socket closure and release, during which a socket remains in state TIME_WAIT, set the value for TcpTimedWaitDelay in the Windows registry editor to the minimum value of 30 seconds (0x1E).

see http://technet.microsoft.com/en-us/library/cc938217.aspx

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\TcpTimedWaitDelay 

Value Name: TcpTimedWaitDelay
Data type: REG_DWORD
Range: 0x1E 0x12C ( 30–300 seconds )
Default value: 0xF0 ( 240 seconds = 4 minutes ) 

To increase the number of available ports: increase value for MaxUserPort

see http://support.microsoft.com/kb/196271

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\MaxUserPort

Value Name: MaxUserPort
Value Type: DWORD
Value data: 65534
Valid Range: 5000-65534 (decimal)
Default: 0x1388 (5000 decimal)