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Why Does the Windows 11 25H2 Update Break Your Network and How Do You Fix It?
A recent Windows upgrade deletes an important network folder. This bug breaks the internet connection on work computers.
The Windows 11 Upgrade Bug
You might lose network access when you update to Windows 11 version 24H2 or 25H2. This happens during a standard upgrade from older versions like Windows 10 or Windows 11 23H2. The update system wipes out a specific file folder. This folder is located at C:\Windows\dot3svc\Policies.
Missing Network Rules
Your computer uses special rules to join secure company networks. These rules are called 802.1x policies. The dot3svc folder stores these exact rules. The Windows update deletes the contents of this folder. Your computer cannot talk to the secure network without these files. The machine becomes disconnected immediately after the update finishes.
Affected Users
This issue mainly harms office workers and company networks. Home users rarely use 802.1x security rules. Network administrators face this bug often. Reports started during early Windows 11 updates and continue today in March 2026 with the new 25H2 release.
How to Fix the Connection
Use these practical steps to get your computers back online:
- Save the files early: Copy the C:\Windows\dot3svc\Policies folder before you start the Windows update. Put the folder back after the computer restarts.
- Use a guest network: Connect the computer to an open network port. Open the command prompt and type gpupdate /force. This command pulls the rules back from the main server.
- Restart the system: Always restart the machine after you restore the files to ensure the network connects smoothly.