A damaged connection between your computer and the internet causes the issue "Connection failed with code 651.". Additionally, you can fix this error by modifying a system parameter using a tool or the Windows troubleshooter.
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Connection failed with error 651 is a very simple error and it mainly occurs due to the failure of the connection between your computer and the internet. And you can fix this mistake by using the Windows troubleshooter or by using a command to change a system option.