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How Do I Reduce the Time for Canceling TCP Connections in TIME_WAIT State on Win

Created: Mar 28, 2016 10:39:46Latest reply: Mar 28, 2016 15:41:30 1208 1 0 0 0

Hello everyone,

Today I will share with you how to reduce the time for canceling TCP connections in TIME_WAIT state on Windows.

In a large-scale Windows environment, a large number of Transmission Control Protocol (TCP) connections in the TIME_WAIT state exist after Nginx reverse proxy service is adopted. By default, TCP connections in the TIME_WAIT state is canceled in 4 minutes. By default, the dynamical TCP ports ranges from 49152 to 65535. As a result, TCP connections are recycled slowly, which leads to a throughput decrease or access failures (error code: 502). You can modify operating system (OS) kernel parameters to shorten the recycling duration for TCP connections in the TIME_WAIT state and enlarge the dynamical TCP port range. This ensures that OS port resources are available when a large number of clients access the server concurrently.

That is all I want to share with you!

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TomJ Created Mar 28, 2016 15:41:30

1. Log in to the Windows OS as theAdministrator user.
2. Change the recycling duration for TCP connections.
a. On Windows, choose Start > Run.
b. In the Run dialog box, enter regedit and press Enter to open the registry editor.
c. In the Registry Editor, open HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters.
d. Choose Edit > New > DWORD (32-bit) Value and enter TcpTimedWaitDelay.
e. Right-click TcpTimedWaitDelay and choose Modify from the shortcut menu.
f. In the Base area of the Edit DWORD (32-bit) Value dialog box, set the decimal number to 30 and click OK.
g. Exit the registry editor.
3. Modify the port range.
a. On Windows, choose Start > Run.
b. Enter cmd and press Enter to open the command-line interface.
c. Run the following command to modify the port range:
netsh int ipv4 set dynamicportrange tcp startport=5000 numberofports=60000
4. Restart the OS.

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How Do I Reduce the Time for Canceling TCP Connections in TIME_WAIT State on Win

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