VPN is slow after Windows 11! I can’t connect! Change your settings in the Control Panel to improve your connection speed!

Recently, I have changed to Windows 11, and one day the VPN connection suddenly became unstable.

This never happened in Windows 10, so why is it? So this time, I’ll show you how to disable UDP checksum offloading.


Change network settings from the control panel

First, open the Control Panel from the Windows Start menu.

Select “Network and Internet” from the Control Panel.

Then select “Network and Sharing Center”.

In the Network and Sharing Center, select “Change adapter settings” on the left side.

The path to this point is “Control Panel ➤ Network and Internet ➤ Network and Sharing Center”.

Disable UDP Checksum Offload

When you open the adapter settings, you will see a screen like this: right-click on the device of the network to which the earthquake is connected, not the VPN, and select Properties.

From there, select “Configuration”.

From the Advanced tab, select “UDP Checksum Offload (IPv4)” and “UDP Checksum Offload (IPv6)”.

UDP Checksum Offload (IPv6)” to “Disabled”.


This is just an example of a VPN connection problem. Of course, you should also make sure that there are no other problems with your router, network connection, or computer connection method.

If this does not solve the problem, you may try this solution.

I usually connect to the university’s VPN to do research, etc., but suddenly I had trouble connecting to the server.

I used this method to solve the problem, so I am recording it here as a reminder.