Question:

How can I prevent Windows TCP Auto-Tuning from disabling itself after every restart? I have attempted to set it to normal mode using command prompt and TCP Optimizer, but my network speed remains limited to 33/30 Mbps.

Answer:

How to Fix Windows TCP Auto-Tuning Issue

Windows TCP Auto-Tuning is a feature that automatically adjusts the size of the TCP receive window, which is the amount of data that can be received at one time. This feature is designed to improve the performance and reliability of network connections, especially for high-bandwidth scenarios.

However, some users have reported that Windows TCP Auto-Tuning disables itself after every restart, causing their network speed to be capped at a low value. This can be frustrating and inconvenient, especially if you need to use the internet for work or entertainment.

In this article, we will show you how to prevent Windows TCP Auto-Tuning from disabling itself, and how to optimize your network settings for the best performance.

Before we proceed, let us first check the current status of Windows TCP Auto-Tuning on your system. To do this, follow these steps:

• Open the Command Prompt as an administrator. You can do this by typing cmd in the Start menu, right-clicking on the Command Prompt app, and selecting Run as administrator.
• In the Command Prompt window, type the following command and press Enter:

“`

netsh interface tcp show global

“`

• This will display the global TCP settings for your system. Look for the line that says Receive Window Auto-Tuning Level. This indicates the current mode of Windows TCP Auto-Tuning. There are six possible values for this setting:
• disabled: Windows TCP Auto-Tuning is turned off, and the receive window size is fixed at 64 KB.
• highlyrestricted: Windows TCP Auto-Tuning is limited to a very small range of receive window sizes, and is unlikely to improve performance.
• restricted: Windows TCP Auto-Tuning is limited to a small range of receive window sizes, and may improve performance for some connections.
• normal: Windows TCP Auto-Tuning is enabled and can use a wide range of receive window sizes, depending on the network conditions. This is the default and recommended setting for most users.
• experimental: Windows TCP Auto-Tuning is enabled and can use very large receive window sizes, beyond the standard TCP specifications. This setting is not recommended, as it may cause compatibility issues with some routers or servers.
• not supported: Windows TCP Auto-Tuning is not supported by your network adapter or driver, and cannot be enabled.

If the status of Windows TCP Auto-Tuning is disabled, then you have found the cause of your network speed issue. To fix this, you need to enable Windows TCP Auto-Tuning and set it to normal mode.

How to Enable Windows TCP Auto-Tuning and Set it to Normal Mode

To enable Windows TCP Auto-Tuning and set it to normal mode, follow these steps:

• Open the Command Prompt as an administrator, as described in the previous section.
• In the Command Prompt window, type the following command and press Enter:

“`

netsh interface tcp set global autotuninglevel=normal

“`

• This will enable Windows TCP Auto-Tuning and set it to normal mode. You should see a message that says Ok.
• To verify that the change has taken effect, type the following command and press Enter:

“`

netsh interface tcp show global

“`

• You should see that the Receive Window Auto-Tuning Level is now set to normal.
• Restart your computer to apply the changes.

How to Optimize Your Network Settings Using TCP Optimizer

If you have enabled Windows TCP Auto-Tuning and set it to normal mode, but you still experience slow network speed, you may need to optimize your other network settings using a third-party tool called TCP Optimizer.

TCP Optimizer is a free and easy-to-use program that can help you tweak your network settings for the best performance. It can adjust various parameters such as MTU, RWIN, QoS, and more, based on your connection type and speed.

To use TCP Optimizer, follow these steps:

• Download TCP Optimizer from [this link](https://www.speedguide.net/downloads.php).
• Run the program as an administrator. You can do this by right-clicking on the TCP Optimizer file and selecting Run as administrator.
• In the TCP Optimizer window, move the slider to match your internet connection speed. You can use a speed test tool such as [this one](https://www.speedtest.net/) to measure your current speed.
• Select the Optimal option at the bottom of the window. This will automatically apply the best settings for your connection.
• Click on the Apply changes button. You may need to restart your computer for the changes to take effect.

Conclusion

Windows TCP Auto-Tuning is a useful feature that can improve your network performance and reliability. However, if it disables itself after every restart, you need to enable it and set it to normal mode using the Command Prompt. You can also use TCP Optimizer to fine-tune your other network settings for the best results.

We

hope this article has helped you fix your Windows TCP Auto-Tuning issue and enjoy faster and smoother internet. If you have any questions or feedback, feel free to leave a comment below. Thank you for reading!