MaxUserPort and TcpTimedWaitDelayMaxUserPort and

Verifying support for RPC over HTTP Proxy

The changes in this article assume that you have configured a functioning RPC over HTTP Proxy server. To verify that you have enabled support for RPC over HTTP on a server running Windows Server 2003, follow these steps:

1.       In Control Panel, click Add/Remove Programs

2.       Click Add/Remove Windows Components

          This will start the Windows Components Wizard

3.       Click Networking Services, and then click Details

4.       Ensure that the RPC over HTTP Proxy check box is selected.

Adjusting the TCP/IP MaxUserPort and TCP TimedWaitDelay Parameters

By default, when a program requests any available user port from the system, a port is allocated between ports 1024 to 5000. With the default setting, a RPC over HTTP Proxy server will support less than 4000 connections. You will need to set the TCP/IP MaxUserPort parameter to its maximum setting of 65534 in order to support approximately 30,000 RPC over HTTP connections.  The TCP/IP TcpTimedWaitDelay value determines the length of time that a connection stays in the TIME_WAIT state before it is closed. By default this is set to 4 minutes. It is recommended that this be set to 60 seconds for an RPC over HTTP Proxy server.

To add and configure the MaxUserPort parameter:

1.       Start Registry Editor (Regedt32.exe).

2.       Locate the following key in the registry:

          HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

3.    Right-click on Parameters and select New DWORD Value. Type MaxUserPort in the     Name data box, type 65534 (Decimal) in the Value data box, and then click OK.

NOTE: The default setting for the MaxUserPort value is 5000 (Decimal).

To add and configure the TcpTimedWaitDelay parameter:

1.       Start Registry Editor (Regedt32.exe).

2.       Locate the following key in the registry:

          HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters

3.     Right-click on Parameters and select New DWORD Value. Type TcpTimedWaitDelay in the Name data box, type 60 (Decimal) in the Value data box, and then click OK.

NOTE: The default setting for the TcpTimedWaitDelay value is 240 (Decimal), which equals four minutes. Never set this value below 30.

Quit Registry Editor and restart the system.

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