Ensuring Windows TCP Auto-Tuning Stays Enabled After Restart


“How can I resolve an issue with Windows TCP Auto-Tuning where, despite setting it to ‘normal’ using Command Prompt and TCP Optimizer, it reverts to ‘disabled’ after every system restart, especially since my network speed is limited to 33/30 Mbps?”


Windows TCP Auto-Tuning is a feature that optimizes network performance by automatically adjusting the TCP receive window size. However, some users may encounter an issue where their TCP Auto-Tuning setting reverts to ‘disabled’ after a system restart, which can affect network speeds. If you’re experiencing this problem, here’s a step-by-step guide to help you resolve it.

First, check the current status of TCP Auto-Tuning. Open Command Prompt as an administrator and enter:


netsh interface tcp show global


Look for the ‘Receive Window Auto-Tuning Level’ value. If it’s set to ‘disabled’, proceed to the next step.

Step 2: Set TCP Auto-Tuning to ‘Normal’

To set the TCP Auto-Tuning level to ‘normal’, use the following command in Command Prompt:


netsh int tcp set global autotuninglevel=normal


This should enable the feature and potentially improve your network speed.

Step 3: Apply Changes to TCP Optimizer

If you’re using TCP Optimizer, ensure that the changes are applied and saved correctly within the application. This might prevent the settings from reverting after a restart.

Step 4: Check for Software Conflicts

Some applications or services may conflict with TCP Auto-Tuning. Check for any recently installed software that might interfere with network settings and consider temporarily disabling them to test if they’re causing the issue.

Step 5: Modify Registry Settings

If the problem persists, you might need to modify the registry settings related to TCP Auto-Tuning. Before proceeding, create a backup of your registry. Then, navigate to the following path:


HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp


Locate the `TcpAutotuning` DWORD and set its value to `1` to enable it. If it doesn’t exist, create a new DWORD with that name and value.

Step 6: Persistent Configuration

To ensure that the TCP Auto-Tuning setting persists after a restart, you can create a simple script that sets the autotuninglevel to ‘normal’ and run it at startup.

Step 7: Contact Support

If you’ve tried all the above steps and the issue remains unresolved, it may be time to contact Microsoft Support or seek assistance from a professional technician.

Remember, while adjusting TCP Auto-Tuning can enhance network performance, it’s important to proceed with caution, especially when making changes to the registry. Always ensure you have a backup before making any modifications.

By following these steps, you should be able to resolve the issue with Windows TCP Auto-Tuning reverting to ‘disabled’ after a system restart and enjoy improved network speeds.

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