Connection failed with error 651 is a common problem on Windows PCs. There are many windows user reported on forums that they get affected by this error.
This error occurs due to various reasons but the common issue could be IP address conflict or establish the internet connection using a broadband connection as dial-up connection.
If you are looking for a solution for connection failed with error 651, you are at the right place. Here we go.
1. Uninstall and Reinstall Modem Driver
This basis method could solve the issue showing error 651. Simply Uninstall and Reinstall your modem driver will solve your problem. This is for the people who are using modem driver.
2. Reinstall LAN Drivers
Sometimes the issue can be caused due to LAN Drivers. Connection Error 651 problem can be solved when that by reinstalling LAN Drivers.
3. Disable IPV6 for your Internet Connection
You can solve the Connection Failed with error 651 issue by disabling IPV6 for your internet connection. It’s easy to do. Just right click on the connections, select properties, then uncheck the box Internet Protocol Version 6 (TCP/IPv6).
SEE ALSO: Simple Way to Fix Err Empty Response
4. Diable Auto Tuning Feature
One of the best ways to solve the issue Connection Failed with error 651 is to disable auto tuning feature. To do that just start command prompt as administrator then type the command “Netsh interface tcp set global autotuning=disabled” and Press Enter.