I just updated the system and the problem repeats. This time I disabled teredo tunneling pseudo-interface and the problem solved. Then I re-enabled it...

Besides, I edited the registry. (but the bug continued until I adjusted settings on gpedit.) [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\T...

To be specific, I adjusted several settings in "IPv6translation" on gpedit (they used to be "not configured"), and the bug disappeared. And then I rev...

I had the same problem and resolved it by disabling ISATAP on gpedit. I wonder what exactly made this bug on my computer......