Tuning Windows Parameters

For Windows platforms, the default TCP/IP settings are usually sufficient. However, under heavy loads it may be necessary to adjust the MaxUserPort and TcpTimedWaitDelay. These parameters determine the availability of user ports requested by an application.

Parameter	Default Value	Suggested Value
TcpTimedWaitDelay This parameter controls the amount of time the OS waits to reclaim a port after an application closes a TCP connection. It has a default value of 4 minutes. During a heavy users load, these limits may be exceeded resulting in an address- in-use connection exception. Set this parameter in the Windows registry at the following location: HKLM\System\CurrentControlSet\Services\Tcpip\Parameters Value Name: TcpTimedWaitDelay Value Type: DWORD Data: 30 (decimal)	240	30
Value Name: MaxUserPort Value Type: DWORD Data: 65534 (decimal)	5000	65534

Parameter

Default Value

Suggested Value

TcpTimedWaitDelay

This parameter controls the amount of time the OS waits to reclaim a port after an application closes a TCP connection. It has a default value of 4 minutes. During a heavy users load, these limits may be exceeded resulting in an address- in-use connection exception.

Set this parameter in the Windows registry at the following location: HKLM\System\CurrentControlSet\Services\Tcpip\Parameters

Value Name: TcpTimedWaitDelay

Value Type: DWORD

Data: 30 (decimal)

240

Value Name: MaxUserPort

Value Type: DWORD

Data: 65534 (decimal)

5000

65534